Posted by Newt on May 05, 2003 at 12:18:28:
In Reply to: How to transplant crab apple trees? posted by Larry on May 05, 2003 at 07:03:48:
: I have 3 crab apple trees that are about 15 years old and 15 feet high planted in boxes, approx 30" cube on my terrace. Because of the trees in their present planters are much too heavy for the roof that my terrace is on, I have to transplant them into something
I'm not sure that you could trim such a large root as it sounds like a major feeder root, but then major roots are trimmed all the time in bonsai, but they also prune the top growth. The root system needs to be proportional to the top growth. You may need to have a certified arborist take a look at these. Here are two sites that might be of some help with more knowledge than mine. I know that you can post pictures at the first one and that might be helpful. There are some very knowledgable folks there.
This place has a forum as well.
If possible, please let me know what you find out. Best of luck,