Do We Seal Each Conifer and Deciduous Cuts?

My bonsai backyard is a long-term experiment with tree approach. Typically this can be a acutely aware factor, generally it isn’t.

For probably the most half during the last 20 years I’ve sealed cuts on each conifer and deciduous. Sometimes I didn’t seal, resulting from curiosity or forgetfulness or another motive.

Listed here are a number of observations.

The general remark is {that a} sealant may be helpful for each teams of crops, in case your objective is to shut the wound sooner.

Then there’s a divide. Illness is the large query mark.

Leaving jin and shari on junipers is unlikely to trigger bother with illness affecting the residing tissue.

I’ve additionally but to hint the lifetime of a pine, or useless department on it, to illness from an unsealed reduce. It’d occur, however I’ve not seen it. It’s potential the pitch retains most illness out.


A pine beforehand sealed with Kirikuchi, a liquid latex sealant. The wound is closing quick and properly.


There’s no proof this reduce was sealed. Non-sealed pine cuts don’t appear to permit illness to enter, maybe because of the pitch.


A beech pruning reduce—a tough reduce not carved out but—sterilized and sealed resulting from concern a illness would possibly are available in. I’ve seen many situations with deciduous bushes the place illness enters by means of an unsealed reduce. Pseudomonas on maple, fireblight and botrytis on quince, the listing is lengthy. If sterilized and sealed, losses of branches or the entire deciduous tree are minimized.


Stewartia pruning reduce absolutely closed, having used Kirikuchi sealant, after sterilizing. The priority is the excessive frequency of illness from open deciduous wounds versus conifer.

I’ve written elsewhere about sealants that seem to shut wounds at a quick charge, as within the chapter “Wound sealant isn’t helpful in bonsai”, on web page 216 of Bonsai Heresy. Some sealants might have development enhancers in them, like gibberellins, that may elongate cells.

When you’re going to make use of sealant on a deciduous tree, sterilize the wound first, let it dry, then apply sealant. Arboriculturists speak about the potential of locking within the pathogen. Isopropyl alcohol, hydrogen peroxide, or a ten% bleach resolution are sterilizers.

April 2024 Bulletin Board

  • This weekend! The Aesthetics Course co-taught with Andrew Robson, which has a pair areas left—actually trying ahead to this distinctive class, masking a number of subjects together with design, show, shade idea, ceramics, and analysis of bushes to deliver your bonsai presentation to a brand new stage. Two bonsai gardens, one course: April 27-Twenty eighth, Portland, Oregon.
  • The bonsai return to the Portland Japanese Backyard this month, on April seventeenth, that includes a number of stand-out bonsai leant by the Pacific Bonsai Museum, Dan Robinson, and David DeGroot. When you go to, don’t miss the hidden secret bonsai backyard up behind the present store constructing—stroll up the steps and thru the glass doorways—one in all my favourite quiet spots, in a backyard stuffed with such locations

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