Thanks for the replies. Since the original post, the lawn is gone, bark mulch covers the yard, there's a Surinam cherry, a Grumichama, and a Naranjilla in the ground, with some figs and a mandarin to follow. Oh yeah, and coffee and tea plants. I view it as a long term experiment -- things that can't hack it will end up in the compost and I'll try other plants. Regardless of what fails or succeeds, I'm not wasting water on that sad excuse for a lawn anymore!