We have a couple of large lawns at our house, but the term lawn is probably pushing it! We almost never water because it does no good. The lawn goes dormant in the summer anyway because it's drought tolerant grass to begin with. It looks fantastic in the Spring though. We also never fertilize it, since it does no good. If I was in the city, it would be awful, but we're in the middle of nowhere and no one can see it but us, so it really doesn't matter. Our dogs need some lawn though!
