Echeverrias. These are better in pots, but a small collection can add a lot of interest to a patio. These don't like frost, and some don't even like the occasional cold, wet winter in Los Angeles. Once they get through the winter, they tend to recover their previous splendor by summer. They can be moved to a more protected location - a bright spot under eaves on the south side of the house, but we prefer to let them go through their cycle - moving pots is a lot of work!