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bonsaiTALK Master
Join Date: Feb-2005
Location: NW Oregon
Country: USA
Posts: 307
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The problem is if you have a tree planted in ammended soils and the native soil is very hard then the new root growth will stay in the good easy soil. Sometimes this can kill the tree.
If you plant a tree in the ground and leave it there for 5 years the roots will end up growing a few feet if not more beyond the initial hole you dug. At this point adding a free draining mix doesn't reallygive you much benefit.
We plant several thousand trees in the ground each year for bonsai. We have the typical NW clay-ish soil and the trees grow just fine. The only thing that is done is before planting the dirt gets tilled to about a 12" depth.
If it were me I would plant it in what ever native soil that you have, unless it is real rocky then I would look to dig a huge section out and fill it with some loam.
Happy Growing!!
Jason
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