I do think that tree roots are my big problem also, Pandora. When we dug the space for the Hostas 20 years ago, it was nothing but roots and took us several days to clean it out. The garden runs down along the woods, and I am sure that is part of the problem now. It is not possible to dig that all up again, but I will add more fertilizer and water like crazy this year. I may be able to dig some of them, but not all.
