Silver Torch Cactus – Cleistocactus strausii
Height: 6 – 10 feet Width: varies (each cane has 2-3″ diameter) Bloom color: Red Flowering season: Summer USDA minimum zone: 9 Cold hardiness: 23° F
Smooth Edge Agave – Agave weberi
Height: 5 – 6 feet Width: 6 – 8 feet Bloom color: Yellow Flowering season: Summer (mature plants only) USDA minimum zone: 8 Cold hardiness: 12° F
Sissoo Tree – Dalbergia sissoo
The bright green leaves of the Sissoo Tree are held to its branches by long petioles, allowing them to catch the slightest breeze and “shimmer” in the sunlight, earning comparisons to the better known Cottonwood and Aspen. However, Sissoo Trees are more drought and heat tolerant, and faster growing than their quaking counterparts. In the…
Silver Leaf Senna – Senna phyllodinea
Like other Senna varieties, Silver Leaf Senna is a popular choice for both residential and commercial landscapes because of its exceptional heat and drought tolerance, and open rounded form when left un-pruned. Tucson gardeners appreciate this plant for the dense, yet airy, silver-grey foliage that clings to the shrub year-round and makes an attractive screen,…
Silver Dollar Gum – Eucalyptus polyanthemos
Height: 45 – 75 feet Width: 30 – 45 feet Bloom color: Cream White Flowering season: Winter USDA minimum zone: 9 Cold hardiness: 20° F
Silver Mound – Artemisia schmidtiana ‘Silver Mound’
Height: 1 – 2 feet Width: 1 – 2 feet Bloom color: Inconspicuous; Yellow Flowering season: Summer, Fall USDA minimum zone: 4 Cold hardiness: -30° F
Sierra Sundrops – Calylophus hartwegii
Height: 1 – 2 feet Width: 2 – 3 feet Bloom color: Yellow Flowering season: Spring, Summer USDA minimum zone: 7 Cold hardiness: 0° F
Silver Dalea – Dalea bicolor
Height: 3 – 8 feet Width: 3 – 8 feet Bloom color: Purple/White Flowering season: Summer, Fall USDA minimum zone: 8 Cold hardiness: 15° F
Silver Cloud Texas Ranger – Leucophyllum candidum ‘Silver Cloud’
Height: 3 – 6 feet Width: 3 – 6 feet Bloom color: Dark Purple Flowering season: Summer, Fall USDA minimum zone: 7 Cold hardiness: 10° F