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I agree with what Tony said.
The method I use is to just let the roots grow and then a two years before I plan on lifting them I prune the roots
with a very sharp nusery spade.

I have Shimpaku junipers that have been growing in the ground for 10 years w/o root pruning. They are so slow growing, they need all the energy they can muster to thicken the trunks. In 10 years they went from pencil size to 3 " at the base.

I have J. White pines that I have root pruned a couple of times-it slows the growth on them which is what I want to do with the pines.

In the end I think alot depends on the species.

19-May-2002	#10
GaryS bonsaiTALK Master Craftsman Join Date: Mar-2002 Location: Wisconsin Country: USA USDA Zone: 4a AHS Heat Zone: 4 Posts: 729	Re: growing in the ground I agree with what Tony said. The method I use is to just let the roots grow and then a two years before I plan on lifting them I prune the roots with a very sharp nusery spade. I have Shimpaku junipers that have been growing in the ground for 10 years w/o root pruning. They are so slow growing, they need all the energy they can muster to thicken the trunks. In 10 years they went from pencil size to 3 " at the base. I have J. White pines that I have root pruned a couple of times-it slows the growth on them which is what I want to do with the pines. In the end I think alot depends on the species. __________________ GaryS