I ATTEND Rock garden programs every chance I get, hoping they will say something about woody plants. If they do, it is usually just something on daphnes. Of course, they say a lot about the small perennials, and I guess there are a lot more of those than woody plants. So I decided that if I want to read about woody plants for the rock gardens, I have to write about it myself, even though I don’t consider myself an expert. By the way, plants I discuss are growing in our garden in Iowa (Zone 4) and if you like, you can come see them, anytime. I will start with trees, then shrubs, and lastly, my favorite, conifers, which are small trees in the alpine landscape.