Hadn't seen Waterboxx before - great concept. He's so right about the
trees. When Arizona Homegrown Solutions got a grant to revamp the tree nursery at Scottsdale Community College, one of the things they wanted to do was revamp the "deep pot" area for growing
native trees because they had noticed the same die-off behavior in trees with pot-bound tap
roots. They initially start trees in tall PVC tubes to encourage tap
root growth.