A large-growing aloe hybrid that can handle freezes into the low 20's and can resist long periods of drought.
Agave 'Blue Glow'
A variable species, all forms of this tough echeveria can handle frosts into the low 20s. Excellent plant for the landscape, and can survive on little water once established.
Another highly variable species, all forms of this succulent can handle cold winters as well as hot summers. Produces a powder white residue on its leaves and red leaf margins. Hardy down to the high teens.
This member of the ice plant family is the perfect ground cover choice for landscapes. Its cascading habit is remarkable, spilling over walls to a length of four feet, and forming swathes of green carpeting in a garden. This yellow-flowering species is hardy down to 5 degrees Fahrenheit, and handles the summer heat without any problems.