Helianthella castanea
Diablo Helianthella
Description
The perennial herb Helianthella castanea is a rare plant endemic to California, and is only found in the San Francisco Bay Area, mostly in and around Mount Diablo State Park. Its common names include Mount Diablo helianthella, Mount Diablo sunflower, and Diablo rockrose. A member of the daisy and sunflower family, the flowers are bright yellow and daisy-like, with ridged petals. The plant grows in clumps of green foliage and sends up flowers on long stems. It can reach 1.5' tall. It does best in full sun with well draining soil.
Plant Type
Perennial, Herb
Height Range
1-3'
Width Range
Flower Color
Yellow
Flower Season
Summer
Leaf Color
Green
Bark Color
n/a
Fruit Color
n/a
Fruit Season
n/a
Sun
Full
Water
Low
Growth Rate
Moderate
Soil Type
Sandy, Loam, Rocky
Soil Condition
Well-drained, Dry
Soil pH
Neutral
Adverse Factors
n/a
Design Styles
English Cottage, Meadow, Mediterranean, Ranch, Spanish
Accenting Features
Showy Flowers
Seasonal Interest
Summer
Location Uses
Entry, Lawn, Parking Strip, Patio, Park, Parking Lot, Roadside, Walkways, With Rocks
Special Uses
Container, Erosion Control, Mass Planting, Lawn Substitute, Hanging Baskets
Attracts Wildlife
n/a
Water Saving Tip:
Apply as little fertilizer as possible.
If you use fertilizer make sure it stays on the landscape, and carefully water it in so there is NO runoff.