by Cynthia Tanyan
Mozaic Landscapes, Sunol, CA
APLD Bay Area District Member
The Toughest of the Tough: Plants for Greenroofs
For 20 years, Cynthia Tanyan has designed over 500 varied residential gardens throughout the SF Bay Area and beyond, including a master plan for a Stanford Lands horsepark, a rural cemetery in Massachusetts, a Native American sculpture garden, and an extensive modern greenroof.
Cynthia's designs have been featured in Sunset (she is a recipient of Sunset's "Best in the West" and "Dream Gardens" Award) and People magazine. Her designs can be seen in The American Meadow Garden, by J. Greenlee (c.2009), and Reimagining the California Lawn, by C. Bornstein.
Greenroofs are tough environments for plants as they are usually exposed to all-day sun, wind, drought conditions and have only a shallow root zone. This is similar to native conditions for many rock garden and succulent plants. Sedums of all kinds are the mainstay for greenroofs. Choose plants that are tough, stay fairly low to the ground, and don’t require much deadheading or other maintenance.
Photo courtesy of Saxon Holt.
Perennials/Shrubs/Ground covers:
Achillea millefolium, COMMON YARROW
Dymondia margaretae, SILVER CARPET
Juniperus (low growing varieties) time for a comeback?
Nepeta ssp., CATMINTS
Phacelia grandiflora, LARGE-FLOWERED PHACELIA
Rosmarinus officinalis cvs., GROUNDCOVER ROSEMARY
Thymus serphyllum cvs., CREEPING THYME
Grasses:
Bouteloua gracilis, BLUE GRAMA GRASS
Calamagrostis foliosa, MENDOCINO REED GRASS
Carex pansa, DUNE SEDGE
Festuca amethystina, TUFTED FESCUE
Succulents:
Agave pumila, MINIATURE AGAVE
Agave victoriae-reginae, QUEEN VICTORIA AGAVE
Aloe aristata, LACE ALOE
Crassula capitella, ‘Campfire’, CAMPFIRE CRASSULA
Dudleya pulverulenta, CHALK DUDLEYA
Euphorbia tirucalli ’Sticks on Fire’, RED PENCIL TREE
Mangave, ‘Bloodspot’, BLOODSPOT MANGAVE
“Sedum carpet” (available at Succulent Gardens)
Sedum album, STONECROP
Sedum reflexum, ‘Blue Spruce’, BLUE SPRUCE STONECROP
Sedum rupestre ,‘Angelina’, GOLDEN SEDUM
Sedum spurium cvs., DRAGON'S BLOOD
Sempervivum spp., HENS AND CHICKS
Senecio serpens, BLUE CHALKSTICKS
Achillea millefolium
Photo courtesy of Emerisa Gardens.
Agave victoriae-reginae, QUEEN VICTORIA AGAVE
Photo courtesy of San Marcos Growers.
Calamagrostis foliosa, MENDOCINO REED GRASS
Photo courtesy of Emerisa Gardens.
Carex pansa, DUNE SEDGE
Photo courtesy of Emerisa Gardens.
Crassula capitella, ‘Campfire’, CAMPFIRE CRASSULA
Photo courtesy of San Marcos Growers.
Dudleya pulverulenta, CHALK DUDLEYA
Photo courtesy of San Marcos Growers.
Dymondia margaretae, SILVER CARPET
Photo courtesy of Bamboo Pipeline.
Euphorbia tirucalli ’Sticks on Fire’, RED PENCIL TREE
Photo courtesy of San Marcos Growers.
Festuca amethystina, TUFTED FESCUE
Photo courtesy of Devil Mountain Wholesale Nursery.
Juniperus (low growing varieties) time for a comeback?
Photo courtesy of Village Nurseries.
Mangave, ‘Bloodspot’, BLOODSPOT MANGAVE
Photo courtesy of San Marcos Growers.
Nepeta ssp., CATMINTS
Photo courtesy of Emerisa Gardens.
Sedum rupestre ,‘Angelina’, GOLDEN SEDUM
Photo courtesy of Bamboo Pipeline.
Sedum spurium cvs., DRAGON'S BLOOD
Photo courtesy of Bamboo Pipeline.
Sempervivum spp., HENS AND CHICKS
Photo courtesy of Village Nurseries.
Senecio serpens, BLUE CHALKSTICKS
Photo courtesy of San Marcos Growers.