Cork Oak air layer

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Cork Oak air layer

Postby SteveW » March 24th, 2017, 12:49 pm

Several years ago I tried to air layer a tall cork oak. I ring barked the trunk, and after 2 years the cut had healed over. Last year I repeated the exercise, this time tying a piece of wire around the top of the ring barked section. This time the airlayer worked, with good roots along one side of the cut. The air layer pot is a 30 cm orchid pot. I had sprays on the air layer pot and the parent tree's pot to keep both growing.

Here are the pictures.

IMG_20170324_094820.jpg

The branches with leaves coming out of the air layer pot are from below the air layer cut.

IMG_20170324_094935.jpg


IMG_20170324_095144.jpg


IMG_20170324_100823.jpg

I exposed the cambium on the side with no roots and applied rooting hormone. If new roots don't grow I will do a root graft next season.

IMG_20170324_110909.jpg

I plan to hollow out the trunk on the bottom (parent) tree and keep the left hand leader.

IMG_20170324_101856.jpg

I may use this, or seedlings for root grafts.
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Re: Cork Oak air layer

Postby jarryd » March 24th, 2017, 4:35 pm

Nice work Steve. Fingers crossed for you the other side sprouts roots :fc:
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Re: Cork Oak air layer

Postby SteveW » March 24th, 2017, 6:20 pm

Thx Jarryd.

Yes, i hope it roots. If not, it gives me a use for the seedlings i have as root grafts.
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Re: Cork Oak air layer

Postby Jarad » March 24th, 2017, 6:38 pm

Glad to hear you've finally had some success! :fc: you can get some roots on the other side.

Look at the bark on the trunk too! :tu:
-Jarad

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Re: Cork Oak air layer

Postby no idea » March 24th, 2017, 10:32 pm

what do you put down as being the cause of only one side growing roots? was it the sunny side? was the unrooted side the first/last section to heal over from the first attempt? I'm assuming the air layer was done at the same location :whistle:
why did you tourniquet the already ring barked trunk? it just seems to me that the cambium wasn't completely removed the first attempt and tourniqueting the top would suit no purpose as the flow from leaves to roots has been severed. Interested in your thoughts

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Re: Cork Oak air layer

Postby Jarad » March 24th, 2017, 10:46 pm

no idea wrote:why did you tourniquet the already ring barked trunk? it just seems to me that the cambium wasn't completely removed the first attempt and tourniqueting the top would suit no purpose as the flow from leaves to roots has been severed. Interested in your thoughts

He mentioned that the area that he ring barked the first time completely healed over. This time when he ring barked it, he wrapped wire around the heartwood that butted up against the cambium. It acts as a barrier so the callous grows away from the trunk instead of down it. I'll see if I can find an example photo.
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Re: Cork Oak air layer

Postby no idea » March 25th, 2017, 12:43 am

cheers Jarad :cool:
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Re: Cork Oak air layer

Postby SteveW » March 26th, 2017, 7:47 pm

Jarad's reply answers the question about using a torniquet.

Re No Idea's question, I have no idea why one side grew roots. After 1 failed attempt and several yearsof trying, 50% success rate is fine.
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