im from central Kentucky ridges near the ky river. My soil is not ideal. Mostly clay and rocks. I have nursed a number of Chinese chestnuts and hazelnuts and oaks along for two or three years now. They are starting to really show some good growth as I assume the root systems took a while to plow their way through the clay. Should I fertilize them? If so when and with what kind of fertilizer? I have a bunch of apples pears and cherries too--you you suggest the same treatment? Thanks for all your suggestions. I'm not a pro by any means but would love to have a forest of chestnuts in a decade or two.