Bright green sedum grows in the center top and repeats in the lowest tier. Crassula perforata forms a fluffy, reddish purple ring around the top tier. In the middle tier: more crassulas, green-purple Senecio jacobsenii, blue Senecio mandraliscae and a type of yellow-variegated aeonium called Kiwi. Silvery blue ruschia cascades from the lowest tier, and alongside it is a type of green and orange crassula called Campfire. The photo was taken at EuroAmerican Propagators in Bonsall, Calif.