Cactus gardening in Zone 8b. Desert plants and Cacti in a water wise rock garden. Cacti like Echinocereus and Echinopsis to Ocotillo and Agave, beautiful flowers, bold evergreen structure, and blooms all colors of the sunset. A trial and error journey to discover cold hardiness where only the fittest will survive high temperatures, high humidity, and temperatures in the teens. Not to mention an onslaught of rock squirrels and cactus beetles.