Thanks! Unfortunately I followed some very poor advice from my immediate neighbors initially after building our house, so I didn't start to space out my watering until this past summer, and only then for the last month or so. I will start off watering for a depth of ~3 inches and see how it does. Of course, if a core sample suggests otherwise, I'll adjust accordingly. If I can train it to go deeper than 4", I will. Do you typically see root depth improve noticeably in one growing season? I was also considering installing a soil moisture sensor, but my sense from scanning the discussions from the community is that it's not widely done. We do have a personal weather station that communicates with Weather Underground, so I'm hoping to at least get that local data to help with my Rachio's "intelligence." I've read the threads that deal with that.