Black Widow AgaveAgave desmettiana Black Widow Is a dramatic variegated agave known for its deep green to near black leaf centers contrasted with bright yellow margins. Its smooth, arching leaves create a striking focal point in desert and modern landscapes. Water Requirements: Low. Drought tolerant; water occasionally during extended dry periods. Soil: Well draining, sandy or rocky soil. Growth Rate: Moderate. Bloom Time: Blooms once at maturity (after many years);