25 SILVER CASSIA Senna Artemisioides Shrub Flower Seeds BLOOM TIME: All Season (Repeat Bloomer) HARDINESS ZONE: 8 - 11 PLANT HEIGHT: 48 - 60" . . . PLANT SPACING: 36 - 48" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average - Dry This Cassia is an evergreen shrub with silvery blue-green sprays of foliage. It has fragrant flowers that attract bees, birds, & butterflies. This Australian native grows quickly and is tolerant of all soil types and drought.