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Moving mature trees

I need advice on moving a Japanese Maple tree. The tree
is 10 feet tall, and has begun to grow unevenly
because it was planted too close to a very large wisteria in
front of our house. Ideally, we would only move it 8-10 feet,
as there is a wide open space with lots of sunlight just east of its
current home. I don’t know how deep the Japanese Maple typically roots,
or how difficult this may be, but any information you
could provide would be very much appreciated.

According to the book Japanese Maples by J. D. Vertrees (Timber Press,
1987), Japanese maples do not have deep, tap-root structures, but are
mainly a fibrous root network which stays in the upper level of the soil.
As they mature, however, there will be roots going deeper, so if you are
planning to move the tree, you will want to be sure to get as much of the
root ball as possible. If the tree is not too old, it should be easier.
Make sure to water the tree well and prepare the new site before you
begin digging carefully.

The Royal Horticultural Society has general information on moving
mature trees and shrubs which may be of use to you, keeping in mind that
fall is a good time for you to move a tree here in the Northwest.

You can also contact a certified arborist for advice. For a referral,
contact Plant Amnesty.
You can also go directly to the local chapter of ISA, the International
Society of Arboriculture.