Posts tagged “air layer

Ginkgo biloba ‘Mariken’ Air Layer

This is a very dwarf and dense variety of Ginkgo that I picked up at a specialized nursery for a good price. I keep telling myself that I will not buy nursery material unless it is exceptional but it is tough to live by this rule!

Ginkgo biloba 'Mariken'. If the layer is successful, this tree will quickly develop into a simple but attractive shohin.

Anyway, like most dwarf conifers, this specimen is grafted  – and the graft is very ugly. I knew this when I bought it, so air layering was definitely part of the plan.

Graft showing massive reverse taper below the bulge.

I have air layered a number of trees successfully in the past, and normally start the process in the late spring after the leaves have just hardened off. Of course, there is more than one way to do things in bonsai, and Graham Potter made a video which does a great job of summarizing his approach to air layering. The video can be watched here.

A summary of the key points of his process is as follows:

  • Start the layer in the early spring, when the tree is just beginning to show signs of activity.
  • Cut away a ring of bark, and scrape away all of the white phloem tissue until you have reached the sapwood below
  • Clean cut the top of the ring with a sharp knife
  • Rooting hormone doesn’t really help
  • Pack the sphagnum moss tightly against the trunk. Good contact between the moss and the trunk is important.

I am keen to try Graham’s approach, because starting the layer as early as possible will give it more time to develop in our short growing season.

The one time I tried a Ginkgo air layer, it failed. The tree bridged the ring wound – probably because I did not scrape away the phloem. When I re-opened the wound, the tree died. However, I know that Ginkgo are conducive to air layering because a friend of mine has layered a pretty chunky branch of a specimen Ginkgo yard tree.

The ring wound after scraping away the white phloem tissue.

The completed layer, packed tight up against the trunk.

Hopefully this tree continues to bud out and shows some roots soon!