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Restoration Pruning


RobArb
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Sorry Rob. I went back to that site a few weeks ago. The tree had tons of epicormic growth, but much more above rather than below where we had partially ring barked it. I was expecting that by ring barking part of the stem, hormone patterns might be disrupted and new shoots would form lower down.

 

I would suggest that perhaps it didnt work on this tree due to the diameter of the limbs we tried it on. The stems were 12 to 18inch diameter. Perhaps with stems at this size it easy enough for trees to divert energy and hormones around the damaged area. Maybe it might work better on older larger diamater stems where the flow of resources follows more distinct channels through the tree? I really don't know, just trying to guess whats going on.

 

Those lumps under the bark are the the start of epicormic shoots. I've often wandered if the older, thicker bark lower down the stem becomes just too thick for these shoots to penetrate. Have you ever seen them when they become big horrible spines but still do not manage to get out? Could be why some vigourous trees (Eucs,Pops) never manage to recover from a hard, low pollard. With a true pollard the bark above the knuckle is much younger and thinner.

 

All this is just thinking out loud, I just dont think anyone knows enough about this or the answer would already be out there for all of us.

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There was an excellent series of photos in an article by Neville Fay recently in the ISA newsletter, which showed the effects of restoration pruning an oak over a period of 100 years, from a top-loaded tree with epicormics back to a low-spreading and balanced crown, presumably through a series of timely and light interventions. I'll see if I can get permission to post them here. Super thought-provoking.

 

Check out the photo on page 4 of the most recent article.

 

Obviously, thanks to the author...

 

http://http://www.treeworks.co.uk/press_releases_publications.php

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