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bonsaiTALK Master
Join Date: Apr-2002
Location: Santa Clarita, CA
Country: USA
Posts: 311
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Hi, mojo.
I don't have direct experience with either birch or hawthorn, but here are some general answers to your questions:
1. leaves turning yellow: is this happening to only the branch that were air layered? If so, I would say this is on the way out.
2. watering: yes you should water to keep the spagnum moist.
3. layering in series: it's okay to do if the tree is healthy and growing well
4. starting layers now: probably not a good idea as it is kind of late in the growing season.
Good luck,
__________________
Paul
"Life will be sweet like a rhapsody
When I paint my materpiece"
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