I live in San Diego and I have an enormous yard by So CA standards. I need an established shade tree because I'm too old to wait around. I found a good size Mimosa silk tree in a 24" box for $250. I want to plant it in a lawn area in the yard which would give me instant shade. I can control the watering. I researched and didn't find anything awful but I thought I'd ask you experts if I should run away from this tree. Thanks!