Nothing. Feed it, water it, love it, curse at it. And this stuff is like weeds here. The one in the corner of the yard, which I neglect pitifully, is gorgeous.
The bad ones are in the front of the house, western exposure. We had a couple of pretty serious (for Arizona) freezes this year, but I cleaned them up months ago. I wanted them for ground cover around a Chinese Elm, and my BF thinks it’s too much shade. But the neglected one in the corner, has filtered afternoon shade from a huge Palo Verde about 10’ from it.
Any ideas?