Will Baddeley Carving Workshop

Thanks to the generosity of John (known as reddog on bonsainut) and Bob out at Kimura Nursery I was able to attend Sunday of the weekend Will Baddeley carving workshop. I came out of this workshop learning a few things: 1) Ume has thick bark, 2) Don’t wear flip flops around power tools. In all seriousness it was a fun workshop and thanks to Bob for letting me possibly depreciate one of his trees 😅. I didn’t talk to everyone there but it was great to meet several new people. I’ve been putting a greater effort into remembering names so if you ever see me, you can put me to the test by saying hi.

I don’t have much time for a very detailed write up, but I do have lots of photos of everyone’s trees. This post will be more akin to a photo journal.






















Bob was a great host and Will’s a great artist who gave plenty of guidance and advice. Hope you enjoyed the photos and have a great day.


Dai Ichi Bonsai Kai 33rd Annual Show

This past weekend I was able to attend Saturday of the weekend Dai Ichi Kai show in Gardena. I saw lots of familiar faces including Jason and Doyle Saito who I met at the Bonsai-a-thon in February. I’ve been putting a lot of work in my website and pushing content on social media so it was great to be approached by people who heard by word of mouth or through my site about my apprenticeship in Japan. Even if you do not know me personally, if you ever see me in person please say hi. I’m always up for a conversation about bonsai or anything.

Vendors had a decent variety of tree and pots. Although I didn’t find anything worth picking up I did grab a Si-Diao carving tool in anticipation of the Will Baddeley workshop next week.



A beginner’s workshop was held in the morning but I did not participate as it looked like they had plenty of instructors. The material provided was excellent though and I give props to whoever sourced it for this show.


It was great to catch up with many familiar faces and also to talk Kaya in person, who like me is pursuing bonsai professionally. I did not photograph all the trees at the show, but did get the tokoname display as well as a few trees I found interesting.





The demonstrator for this show was actually Kaya. He worked on a procumbens he brought through the airport from Hayward. Not without difficulties as the pot cracked post TSA inspection. Having had brought a tree through TSA before I can attest to the additional inspection and strange stares from onlookers.

Overall the demonstration was pretty successful.


Those who watch the live streams on Facebook, give a big thanks to Jason Saito who’s doing the behind the scenes work and filming.


Assistance from a club member


Getting somewhere


Unfortunately I could not stay for the dinner and Sunday I drove back to Riverside. All in all it was an enjoyable show and I was happy to meet and talk to many new people. Next week I’ll be attending the Will Baddely workshop, courtesy of John and Bob who sponsored the fee cost. Should be a good time and I intend to write a post on the event.

Many thanks to all my past and new readers. It’s been a busy month and slow in terms of updates and content. Sometimes I’ll post pictures/updates on my Facebook and Instagram when I don’t have time to write. If you’re on any of those platforms be sure to follow me there. (they’re linked on the sidebar of my homepage)

Hope you’ve enjoyed this update and have a great day!


Japan, here I come.

Despite all my efforts meticulously planning for my visit to Japan, a few things slipped through the cracks. Among them my plug converters rendering my laptop a fancy paper weight to slow me down at airport security checks. As such I hand wrote this article 2 nights ago and now, in my delirious jet-lagged state, I am transcribing it to share with others.

I have been accepted as an apprentice at Fujikawa Kouka-en. (en means garden or nursery) It’s been a pretty insane path getting to this point and I would have never anticipated moving to Japan 4 years ago.

Bonsai for me has been an outlet. I absolutely love working with my hands. The unique combination of a living tree with arguably, art pulled me in with no other comparison. I get an immense gratification doing bonsai and right off the bat, I knew I had to get involved.

Within the best of my mental capacity and time I’d try to go to all the local shows, join clubs, and to reach out to both hobbyists and professionals in the bonsai community. People who know me well, know that I don’t have a very outgoing and sociable personality. From problems I had at home and during high school my confidence was completely shattered. The past 4 years in college has been a slow process of rebuilding it and I’m fortunate to have met some great people.

The irony of it was that my pursuit is akin to a hyper social lifestyle where the bonsai community is comprised of a very mixed ethnic and age demographic. Many professionals in this trade often travel in access of 200 days per year. Insanity. Talking with my peers is one thing, but a bunch of old farts in a club room? (not all old 😉 ) It was interesting to say the least.

Maybe if I had good a cushy 9-5 waiting for me after graduation I would not have put so much effort in my bonsai ventures. But at the end of the day, I was driven and I would do anything that had to be done to realize my goal.

Getting involved in the club scene and talking to thousands of people seemed impossible, especially with my commitments and time constraints from a moderately difficult academic pursuit. But you know what they say–“work smarter, not harder.” So a little over a year ago I built my website and spent countless of hours and long nights to produce quality articles. Slowly but surely I gained traffic and more exposure than I could have achieved purely from talking to people in person.

Through my site I was contacted by Mr. Chuah, also the winner of finest tropical tree at the 5th US National Bonsai show and a patron of the art out of the Houston area. He offered to introduce me to Owen Reich, a bonsai professional, so I could learn about the apprentice and professional lifestyle. Mr. Chuah has been very supportive of my ambitions and without his introduction, I may have never reached out to meet Owen when I found out I would be moving to and working near Chicago last summer. Many thanks to Jeff Schultz, the owner of the Hidden Gardens as well who enabled me to get involved and meet many people in the Midwest bonsai scene.

Following that summer I was convinced that I wanted to go for bonsai professionally and if I could find an opportunity I’d seize it. I was knocking on any doors I could find, domestically and abroad and frankly, not having any success. It made my day when Owen told me that they were looking for apprentices at Kouka-en and he could help me get my foot in the door.

Traveling by myself to a foreign country for the first time, let alone one I had never been to nor knew the language terrified me. Maybe my parents more than me. In the 2-3 month time span I was preparing to visit Japan I would study 4-5 hours a day at least 3-4 days a week between my coursework at college. My intention was to start at ground zero and enroll in Japanese 1 at my University, but it was not available for the next quarter. I ended up self studying and passed the placement test to take the course a level above.

This gave me a baseline for rudimentary communication, asking directions, ordering food, and a very mixed vocabulary. Naoki Maeoka, the senior most apprentice at Kouka-en, speaks excellent English and I’m very grateful for his help translating. I also received a lot of help advice from Tom Ulecki, the other apprentice at Kouka-en. They’re both very nice and hardworking people and I’m glad to have their acquaintance.

Maybe I just worry too much but things worked out this time around. Nothing too crazy, I just talked to Mr. Fujikawa, now my Oyakata, and he said he would accept me as an apprentice. The week spent in Japan has been a mad dash of exploring the city, and rushing back to the nursery to sort out details and work a little. I move to Osaka in August and who knows how long I’ll end up staying.

Maybe my career choice is not the most lucrative but its a passion I have the opportunity and ability to pursue. Insane? Plenty. Irresponsible? No.

I’m thankful for everyone who has supported me or given me advice, but also to my parents. Despite our problems, without their support pursuing my dream would be much harder. I am very excited for my new pursuit and it will only get more crazy from here.



I’ve taken many photos both in the nursery and in the city. Please take a look:




Famous tree, maybe some of you recognize. There was not enough space to stand back and get the entire tree in the frame.




Important bonsai tag.











Amazing arakawa maple. Oyakata allowed me to work on this tree, just pinching of new growth to reduce to 2 leaves per branch.

Below I have pictures from Osaka Castle Park, Nara Park, and Kasuga-Taisha Shrine. These are all free to see aside from some special exhibits inside which cost only around 500 yen.

My favorite photo of Osaka Castle, edited by me






Amazing old growth forest with lots of old camphor and cypress trees.


Maybe my favorite photo of the trip below, very hard to shoot. I maybe only had 45 seconds to walk through the permissible area of the shrine’s interior. Going from bright outdoors means my eyes had no time to adjust and it was extremely dark inside. I had to hold the camera extremely steady while walking continuously in a line with other people. The dust exposed by the ambient light makes this photograph and gives it a lot of atmosphere my other pictures do not have. I was also very lucky it did not turn out blurry as I was stingy on my ISO setting and tried to keep it as low as possible.



Pack of deer cookies cost 150 yen. It was impossible to take a photo while feeding the deer at the same and capturing it bowing. This is the best I have. The moment they think you have food they’ll start bowing and then chew through your clothes if you don’t feed them anything.



On route to the shrine.


Exterior of shrine. I also prayed here wishing for a healthy and successful bonsai career 😀


Amazing old camphor tree.



Hackberry (celtis occidentalis)

I think enough work has been done with this tree to warrant it’s own post!

I purchased this tree from Bob at Kimura Nursery in Northridge. There were 3 qualities I based this pick off of that distinguished it from other trees. First was decent nebari. Basal flare was evident and the potential for a good root base could be had without dramatic work like ground layering.  Second was the graceful trunk line. There’s very subtle movement and the framework for a feminine tree is there. Third was plenty of branch options. Although this is not as critical as we can use grafting to add or improve branch placement, it minimizes the amount of work I’d have to do to create a nice tree. With these 3 criteria strongly met and a good price to boot, it came home with me.


The first task in order was to do a trunk chop and some branch selection. The goal is to do pruning without wasting or expending too much of the tree’s energy. With this in mind the big cuts are done in winter. At this time a lot of sugars and carbohydrates are stored in the roots, not so much in the branches. Should you remove large branches after budbreak in the spring the tree has already expended energy to produce leaves on a part you decided to cut off.


By the same logic when you do root pruning and work, it should be done after the sugars have moved up towards the branches. Typically repotting is done when buds start swelling. But because I live in Southern California with a mild winter and long growing season and that a sizable part of the tree was chopped off (this means there are less branches and buds the roots will need to feed) I went ahead and did my rootwork the same day. Generally speaking it is more advisable to do heavy rootwork at the right time and had the tree been unhealthy, I could of killed it.


Roots were combed out to a nice radial spread and any heavy taproots were cut. Next the base of the tree was screwed to a wooden board. This is to prevent downward root growth and encourage lateral root development. This will allow the surface roots to thick and create a nice flaring nebari you’ll see on a mature and older tree.


The tree was potted up in a wooden grow box. About 3 weeks later (time is purely arbitrary based off my free time) I wired the tree and did thread grafts. No progress shots here unfortunately but basic wiring can be done before bud break. It’s easy to work around the branches without breaking new leaves. In thread grafting they have to be done prior to bud break. Since you are threading the branch through a hole in the tree any protrusions like new leaves would be broken off.





The tree is growing well and will be allowed to grow freely for the next few weeks. Over the course of the growing season I will be repeatedly growing out, wiring, and cutting branches to build the structure. By the end of the growing season a basic structure with primary branches should be set. The shoot on the top will be allowed to grow as the leader which will eventually form the next segment of the trunk. The lowest shoots on the tree will be left to run freely as well. This will help thicken the base and introduce taper into the tree. All in all I am happy with the progress so far. The quality of this material is very good and it has high potential to become an excellent tree in the future.

Bonsai-a-thon XXII

I attended the Bonsai-a-thon, held annually at the Huntington Gardens, this past Saturday. Not only as an observer, but a participant this time around. I arrived at the gardens quite early, around 7:30 AM or so. It was very brisk, as evidenced by the thick layer of frost coating my car. The past week of weather has been highly unusually for Southern California. Temperatures in December were uncharacteristically warm with highs in the mid 80s in contrast to the near freezing temperatures over the past several days.


I talked to the usual vendors there, Barry as well as Frank who always sells his cork jades at a steal of a price. Arriving at the early hours of the show, I was able to get first pick and nabbed some of the nicer ones on table.




I also had a chance to meet up with some of the members from the bonsainut forum. Colin who has been working at and apprenticing at California Bonsai Studio has been a vendor the past few years. Christian, who is a young enthusiast like myself, was also at the show and enjoyed talking to him.


After talking for a bit I headed out to the greenhouse where a Huntington sponsored beginners bonsai workshop was held. I’ve done quite of bit of teaching and mentoring in a diverse range of topics to different age demographics but never quite something like a bonsai workshop. I was contacted by Keith a few months back who coordinates many of the events and volunteering at the Huntington. I was a bit cautious in accepting as I wasn’t sure my current skills in bonsai were up to par, but I’m glad I did. The material provided was excellent, and the students very friendly and eager to learn.







After I was given a student I didn’t realize that they were supposed to go pick their tree. A large group crowded around the table and I’d thought it be slim pickings when we got there. To my surprise there was an excellent procumbens left with good nebari (root flare), a trunk line, and many possible branch options. As per usual I often get carried away in the work and development that I forget to take before pictures to track my progress.

*Found a before short courtesy of Keith Martin

I discussed with my student the criteria for styling a tree and the qualities we desire. To start, a wide root base lends stability and age to the tree. Secondly we need a good trunk line with nice movement. The front of the tree that expressed these 2 attributes best would be our starting point.


Here is a shot of the tree after the first stage of work:


Next any downward pointing growth, weak or dead foliage, as well as any branches that were too thick or too small to be used were removed. In the above photo you can see 2 jins (branch stubs) that show where 2 large branches were removed.

The cleaning stage in my opinion is the most important. It helps reveal the tree and can bring potential design options to clarity. Conversely if you were to try to style the tree right off the bat you’re liable to remove a branch that may have been critical to the design of the tree.

A second concept I discussed was depth and illusion. Sometimes it’d may be difficult or impossible to shorten or lengthen a given branch. But by changing the angle we position the tree the branch can be visually shortened. Imagine a ladder leaning against the wall. Looking at it head on the height of the ladder extends from the upper point of contact to the ground. In reality we know it’s much longer, but in bonsai its the visual length we care about.

With this in mind I suggested that we tilt the tree significantly forward. Doing so brings the apex forward while lengthening the lowest left branch and the drop branch on the right.

From here we wired the trees and tried to from distinctive pads with negative space.

Branch placement set


After further cleaning and potting. This tree ended up being the only tree in the entire workshop that was placed in an actual bonsai pot. Because the tree was tilted so significantly one side of the root system was considerably raised. The provided workshop pots were extremely shallow and small. Placing the root system in such a container would risk the health of the tree. I advised my student that she could leave it in there temporarily but to repot it in a deeper container of her choice as soon as possible. I mentioned that she could buy a pot at the show on the spot and she was completely on board. We picked a reasonably priced round that was met our criteria best and used it for the tree.


To have a very clean image and well executed design detail wiring every branch makes a huge difference. Unfortunately we were tight on time and had to stop here. All in all I think it turned out well and I hope I was able to effectively pass on knowledge to a new bonsai enthusiast. Ann, the student I worked with, picked on very fast and did a good job on cleaning as well as wiring for the very first time. Many bonsai enthusiasts quit after their first tree often from it dying or from the overwhelming amount of information involving bonsai care and development. Bonsai does have a steep learning curve, but it’s a very addictive and gratifying hobby. Perhaps some of the new students today will pulled in and become patrons of the art.



Lastly here are some photos of the trees on display. I missed the demos but there were many excellent trees local artists styled.







All in all it was a great show. Great group of people and made many new friends. Teaching a bonsai class was an interesting experience that I’d be open to doing again. Till next time.


New Projects for 2018

I’ve started quite a few new projects for the year, hopefully setting them on a path to become excellent bonsai in the future.

Perhaps when I take them further in development I’ll give them their own designated posts but for now check em out.


Ficus Microcapra “Tiger Bark” (2014–)

This tree was actually among one of the original bonsai I started with. It began as small cutting grown material from House of Bonsai in late 2014. I proceeded to repot it and let it grow freely for the year. Unfortunately the nebari on this tree was typical of the ikea two leg bulbous roots so in late 2015 I opted to ground layer  the tree and completely rebuild a new root system. This spring I’ll do further nebari work as well as give the first major cutback and preliminary styling.

2016 Ground layer in progress, protecting new roots with foil

The tree now:





Hackberry (celtis occidentalis)

The next project is a hackberry I purchased from Bob at Kimura Nursery. It was excellent material with lots of low branches to choose from, a decent nebari, and nice graceful taper. I cut back the main leader and will allow a low branch to run to give additional girth near the base.

as purchased
Leader cut, Note: use the putty type past for hackbery. Even in the winter after making the cut the tree still bled a lot compared to other deciduous varieties. The liquid paste will run off and the tree will lose a lot of sap

On this tree I chose to screw the base to a wooden board. Doing so forces the tree to grow roots laterally and prevents downward growth. This enables the surface roots to thicken more building a better nebari or root spread.

Roots cleaned. Ideally I should of thinned it more and secured desirable surface roots flat against the board, but given I had already removed 80% of the root system I wanted to play it safe.
Wired and screwed on. Next spring I can do much more thorough cleaning and lateral root selection.

The tree was potted in a wooden grow box I made. No photos of it but nothing special. Onto the next project.


Monterey Cypress:

I was fortunate to find a nice sized monterey cypress as regular nursery material. It had a decent sized trunk as well as good nebari or root flare. I went ahead and purchased it and set out to do a full styling from raw material. It was quite a challenging project for me but I’m very happy with the results. I reduced about 50% of the root mass and probably ended up removing about 70% of the foliage to achieve the final design. Unfortunately no pictures prior to repotting to a terra cotta trainer but here it is before styling.


I’ll have to remove large surface roots and tap roots in the future but will do so in the future when it is established with more feeder roots


In styling the tree it was important to me to create a convincing design but also to incorporate elements seen in the iconic monterey cypress peppering the California coast. The harsh coastal winds produce twisted contorted growth and flat foliage pads.

I chose to initiate the orientation of all branches upwards before flattening out at the tips to emulate their natural counterparts. Wiring all the branches in the same fashion also helps bring cohesion to the design


As “younger” nursery grown material it had multiple sub trunks. I opted to remove the thicker trunk that would be hard to introduce movement to while keeping leaving those that would lend towards clean graceful lines. Here is the finished tree:


As with any 3-D object, a tree no less, it is hard to portray depth in a photo. The back center trunk appears to be competing with the main left trunk and the foliage feels cluttered and messy. Unfortunately I do not have a good lighting set up so the highlights on the center trunk also give the illusion it’s on the same plane as the front left trunk.

While I can ascertain (that’s what they all say right) it looks better in person there are still several things you can take from a flat photo. It helps bring out lines and focal points you’d otherwise wouldn’t notice. Also excellent trees often look good in person (3-D) and in photo (2-D) due to a clear definition of lines and movement. Good or mediocre trees can look good in the 3-D aspect but fail in the 2-D lacking that same clarity.

To my defense as nursery material there is a lot of strong outward apical growth. To style the tree I end up removing most of that leaving the weaker interior foliage. I could remove another 20% of the foliage and do more fine wiring but it would stress a tree that already has had considerable work done to it. Admittedly my wiring still needs work but it improves with every project I do.

Typically I like to do a rough styling and then after the tree has recovered with lots of strong interior growth I do the fine foliage wiring. I’ll have to keep close watch on the aftercare on this tree to ensure I don’t lose any branches or trunks.

Here’s an outdoor shot that may have better depth

There’ll be more to come but that’s it for now. I also thought I’d take this chance to update you guys on my apprenticeship ventures.

I’m still probing Taiwan and have sent out letters but no bites yet. On the contrary I may have a possible opportunity to apprentice in Japan. No guarantee yet, but it’s something worth exploring to see if I can pursue. I may have to swap my studies in Mandarin to studies in Japanese if it works out.

I apologize for not getting out articles and translations on the Taiwanese bonsai book I showed 2 posts back but it’s been a bit more busy than I had hoped for. I’m still heading strong towards my goal though and I’ll keep you guys updated along the way. Thanks for taking a look and I’ll see you on the next post!



How to Sharpen Concave Cutters

*note, I’ll be editing and improving this article over time so check back or ask me any questions on anything you didn’t get*

I’m a DIYer kind of person. I hate sending things out to get fixed or spending money that I could otherwise save. Concave cutters, the quintessential bonsai tool, seldom need sharpening due to the robust design and wide edge angles but like anything else, repeated use will wear it down.

My old pair of concave cutters from Lee Valley was standing on it last legs. Wobble in the pin, chips, rolled edge, and more. As my first and only concave cutter it was abused and used to cut things I probably should have cut. I decided to purchase a new pair from Kaneshin. And of course after a few days I somehow managed to chip the edge. I have a fairly high skill with waterstones and was confident I could repair it. In doing so I understood the criteria for concave cutters to cut well but also realized that there are no comprehensive guides online on how to do so.

I decided to make a guide through the restoration of my old pair.

This guide will be organized in 4 sections:

  1. Criterion
  2. Tool Selection
  3. Technique
  4. Burrs and Finishing

PART I: Criterion 


The first component is seems simple but there is a little more too it. I will elaborate below.

The second criterion is necessary to ensure a clean cut. If the edges do not meet you have a branch with intact wood fibers in the middle.

Lets take a look at my old Lee Valley tool:



From both pictures its evident that the blade is chipped in the center and to lesser degree, on the top. There is another thing worth pointing out. Notice the white hair line immediately below the large chip. That’s light passing through the blades. The edges do indeed meet one another and they are offset (discussed below) BUT they are not touching as evidenced by the light coming through. I’d like to emphasize that the blades are FULLY closed. The light breaking through it not because of that.

For comparison here are my freshly sharpened Kaneshin cutters.


Here is a diagram better explaining this concept. (the text may be hard to read in mobile)

straight edge1

straight edge2

Now I’d like to say that some variance is not that big of a deal. Your concave cutter will still function properly. But we should avoid any significant deviations as gaps between the blades will prevent them from cutting cleanly.

Lastly the tips must be offset:


That black hairline on the top is the edge of the other blade offset over the other. If the tips meet flush even every time you cut a branch they’ll snap together. This can dent, chip, and dull the tool.

At the same time keep overlap as small as possible. You want just enough to prevent the cutting edge from damaging each other. Too large of an overlap and you’ll notice you have trouble cutting branches when the cutters get close to the center.



In short when we sharpen this tool we want to think about these 3 points and ensure we preserve them throughout the restoration process. There are some other important aspects worth consideration that will be discussed in the technique section.

PART II: Tool Selection

From my days working for a knife dealer and being a collector I amassed a decent amount of sharpening tools and water stones. Here is some of what I use:


You do not need expensive fancy tools to sharpen concave cutters. I’ll discuss some of the options and what my preferences are and why.


There are 3 main categories we can think about. Waterstones, diamond abrasives, and sandpaper. To start off I’d advise against using sandpaper. It’s the cheapest but also wears down fast. Arguably if you are only sharpening your tools once a year sandpaper can be a viable option. If you are insistent on using sandpaper there are some things to know.

Use the black silicon carbide sandpaper you find at auto stores. The brown aluminum oxide or red ruby sandpapers will not do a good job at removing metal.

Second, use a hard backing behind the sandpaper not a soft one. This might seem counter intuitive at first but hear me out. Because of the convex outer bevel it may seem logical to use a softer material with some “give”. Maybe a leather belt or piece of rubber. Do not do this. While that “give” allows the sandpaper to wrap around the curved outer face it also wraps around the edge. This can cause blunting or rounding of the tip. The sharper and crisper the edge the better it will cut.


This leaves us with waterstones and diamond abrasives. Waterstones are great tools but they have a drawback–dishing. As you wear the stone abrasive media becomes loose and dishing occurs. This is especially pronounced as you have such a small contact area for a concave cutter compared to say a kitchen knife. With a kitchen knife you abrade nearly the whole surface of the stone continuously so it stays relatively flat. With the concave cutter you are only abrading a small region at a time. The medium you sharpen on is reflected on your edge, so if the stone is dished your edge will not be straight! This creates variance on traverse axis or unequal width along the edge of the blade.


This brings me to my recommendation: diamond benchstones. Actual to be more generic any fixed abrasive media benchstone. In essence something that will not dish. Diamond abrasives are great since they cut well and would be my main recommendation especially if you are sharpening stainless tools. (The “stainless” quality in stainless steel comes from chromium, which also makes the steel more abrasion and wear resistant=harder to sharpen) 

This is what I’m using. A double sided coarse/fine DMT dia-sharp 6 inch stone. I bought mine many years ago when it was a bit cheaper but they run about $50 now.


PART III: Technique


You can hold the concave cutters and position the stone however you want. The 2 things you always want to keep in mind is consistency and geometry.

On the first part. Consistency means repeatability. Every stroke you do on the stone needs to be the same abrading the intended region. By many years of practice I can do this by feel but there are other ways aid less experienced hands. One method is the sharpie trick. Simply color the bevel of the concave cutter with a sharpie and begin working. After a few strokes on the stone pick up the tool and look at the bevel. The areas where the sharpie is gone are the regions you abraded. Doing this can give you a sense of what you are doing and improve your precision. There are lots of videos and guides on this so you can look up the rest yourself.

Geometry is a big key component. Good blade geometry means it will cut well. Poor geometry means a lot of rough cuts and resistance through branches. Generally speaking you want as an acute of a edge angle as you can get without compromising the integrity of the tool. Too thin and you get chips or cracks. Too thick, it’ll be tough but it won’t cut for a damn. Any half reputable manufacturer of your concave cutters probably already know ideal geometry their blades should be ground at and is likely produced within a range of it.

This means you should try to maintain the current blade geometry of your concave cutter.

Maintaining geometry:

  • You match the angles the bevel faces are ground at
    – Inner face is flat so this is easier
    – Outer face is curved, harder
  • Abrade the outer and inner bevel faces the same amount
  • Use the sharpie trick
    – Sometimes I rush through things only to finish and see I ruined an edge
    – Using a sharpie and working slow will make sizable difference
  • Even pressure
    – Although you may be holding the blade flat to the stone if you put a lot of pressure on the tip, more metal will be removed from the tip
    – Lack of even pressure is what causes varience of the blade width along the edge or “high” and “low” spots
    – Try to consciously think about holding it steady and applying force across the length of the edge

Now finally to the sharpening itself:

I’ve said before it doesn’t matter how you hold the cutters. You just want to ensure you can keep it steady and brace it against the benchstone. Here’s how I do it:


Step 1: Working the outer curve

**As mentioned before you want to keep the overlap at the tip. It’s better to start with the undercutting blade first instead of the over cutting one. In the former at most you risk increasing the size of the overlap which can be remedied by working down the over cutting blade. In the latter you could actually could remove the overlap. You could restore it by working down the opposite blade more but is the more difficult approach**

I like to start on the outside and pull back


As you pull back you want roll the bevel forward. Think sweeping motion.


Continue to pull back until you reach the tip


Once you reach the tip, STOP. Do not keep sweeping back. If you continue you’ll start changing the direction of the edge. This can give problems later with poor matching and gaps between the 2 blades when closed.


Effects of rolling too far

After you hit the tip start sweeping forward doing the same motion in reverse


Here is how I hold the tool when sharpen it.


Keep on repeating this motion until you get a burr. I’ll elaborate on this in part 4. Start working on the inside face now:


The inside bevel is flat so you can just do a back and forth motion. It’s imperative you keep it flush against the stone and match the angle. Mistakes here such as increasing the angle of the bevel face against the stone can make the edge more obtuse and greatly impact the cutting performance of your tool. I made that mistake while sharpening my Kaneshin cutters which is why I recommend going slow and checking your work. Keep on working until you’ve created a burr again. Switch to the opposite side to remove it. At this point I’d do alternating strokes between outside and inside bevel to ensure a crisp edge with no remaining burr.

After you’ve succesfully sharpened the edge or removed any chips switch to the overcutting blade. If you want to maintain the very slight overlap between the blades you’ll want to work both blades the same. Whether by number of strokes or simply by feel try not to sharpen one blade significantly more than the other.

Here is the Lee Valley cutter after finishing both blades.

Relatively clean union with little light escaping:


Overlap preserved:


Part IV: Burrs and Finishing

snl reference

If you did the stonework right the edge should be clean with no remaining burrs. I’ve given burrs it’s own part because it imperative that you make sure the edge is clean with no burrs.

If you cut a branch with a remaining burr your edge will roll over wasting your work. If a burr is present you can feel it. Run your finger off one side of the blade. Do so on the other. If one side is smooth and the other significantly more rough there is a burr. You can use a leather strop or even a piece of wood or plastic to remove it. Just sink the edge in something and pull across a few times.

Well that it! Hope it helped. If you did everything right your old concave cutter will be good as new! Maybe. I know there’s a lot of information in this article. Feel free to comment or message me questions. Sharpening concave cutters are fairly complex and was a learning process for me. I didn’t even do that good of job on my new Kaneshin cutters but I’m confident I can do an excellent job on any cutters in the future.

One piece of advise I’d give is use the right tool for the job. I’ve consistently cut branches much bigger than the cutters and have done root pruning with chunks of lava getting crushed between the blades. These led to issues like chips and misaligned tips. If you use the tools properly they’ll function for a long time. But if you ever get to the point you need to repair it, you have a resource now 😁.