I have an English Walnut tree in my backyard, it was here when we bought the house 17 years ago. It was a good size then and we believe the house was built in the 70's. I use to never get a walnut because the squirrels would take them. Remembering from y childhood in San Jose, CA the walnuts just fell on the ground with the outer skin peeling off. I really never see the walnut without its skin unless it is growing from where a squirrel planted it. And if I'm lucky to find a walnut that seems to be ripe, it is smaller than what I'm use to. So I can only surmise that the tree needs some attention, such as; pruning and fertilizing. Anyone have any advice on this as I would love to enjoy my walnut tree's fruit, but don't know if it is just because it is growing in Boise, ID.