[doubled]

I was warned once by an arborist about building up around the roots of trees with a flower bed. he said that it was not good for the tree as the roots as they grow are at the depth they are supposed to be and the raised dirt could harm the tree. We did end up losing the tree, but it was going when I did the flower bed.

Has anyone else heard about this?

[fanfan]

I was warned once by an arborist about building up around the roots of trees with a flower bed. he said that it was not good for the tree as the roots as they grow are at the depth they are supposed to be and the raised dirt could harm the tree. We did end up losing the tree, but it was going when I did the flower bed.

Has anyone else heard about this?

Yes, I've been told the same thing.
I think it relates to the age of the tree VS the depth of soil added. JDB’s oaks are so big that 8-12” of soil is nothing. Do the same thing to a 10 year old oak, and it might be a problem.