Yes, I follow all the traditional permaculture guidelines for maximizing water retention. I have to as I use only rainwater collection for all indoor and outdoor needs. Whatever trees I plant will require all the help that I can give them. We are way behind on rainfall here in a drought that is now at least two years in the making. I live in a very woody area with only a small clearing for my pasture and garden. However, most of the trees that grow around me are scrub oak and hickory. There are some smaller trees that grow in the understory, like Redbud. I am towards the top of a rocky hill. Here they call it a mountain but compared to where I was raised, it's just a hill or more correctly alluvial plateau. I've only been here for about 18 months and spent most of the time working on my cabin although I do have a producing greenhouse, goats, chickens, horse, guineas, etc.