I posted this in the perennials forum as well as that gets more traffic than over here.....I'm contemplating putting in lasagna beds in my back yard for perennials/shrubs (mixed borders). However, since I have lovely clay which is fairly flat (yah, there is a little slope because they spread the stuff they dug out from the pool around rather than cart it away), I'm a little concerned about creating drainage problems....anyone have any experience with this? Thanks.