Sunset Hens & Chicks - Sempervivum - Very Hardy - Live Plant - Quart Pot The color depends on the season, amount of sun, and temperature. Hardy Zones 4-9 Mature Height: 10-20" Full Sun Sunlight brings out bright colors in Sempervivums. When planted in shade or grown indoors away from a sunny window, many varieties tend to fade to a plain green color. It can take up to 3 years to develop the pictured colors.