Help!! I need a tall tree that can survive the heat of zone 9, clay soil, and semi desert climate of southern CA. We have a hideous looking slope behind our property. We're trying to block it out. We planted a cottonwood which is growing nicely, but all landscapers have told us to pull it out. The roots are too shallow and will destroy our patio. Can anyone give a suggestion? We had planted a camphor tree, but it succumbed to wilt disease. I'd appreciate any help I can get.

Also, any suggestions for plants/shrubs that can be used on that ugly non-irrigated slope?

Thanks to anyone who can respond

kassie8