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Attila Soos
Join Date: Jan-2002
Location: Los Angeles, California
Country: USA
Posts: 2,027
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Marija,
The only way to find out whether or the tree produced enough roots is to carefully uncover the top of the layered area and see how abundant the roots are. You can do that any time of the year (have a hand-mister ready to keep the exposed roots moist). If you are not happy with the result, you just have to repeat the procedure next year.
When you layer a maple, the only acceptable result is a perfect one. Maples are very good at developing nice nebari, so that's an absolute must. It is very hard to correct a nebari where half of the surface roots are missing, so working with such a substandard material is a waste of time.
The tree seems to be healty and vigorous, so there is no problem repeating the layer if necessary.
Normally, one growing season should be enough for any deciduous tree.
(For conifers, you need more than one season)
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