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Bransford, W.D. and Dolphia
Coreopsis gigantea (Kellogg) H.M. Hall
Giant coreopsis, Giant tickseed, Tree coreopsis
Synonym(s): Leptosyne gigantea, Tuckermannia gigantea
USDA Symbol: Cogi
USDA Native Status: L48 (N)
Giant tickseed or giant coreopsis produces its bright-green, finely cut, ferny leaves on a stout, erect, fleshy trunk that grows 6-8 ft. in height. Resembles a small tree, with a soft, woody stem that branches near the top, where feathery leaves grow and large yellow flower heads bloom in clusters at the ends of long leafless stalks. The 3 in., yellow daisies, with coarsely toothed petals, are surrounded by deep-green bracts.
Another species, Sea Dahlia (C. maritima), stout but not woody, with heads borne singly on stalks, grows in coastal San Diego County. It is not a true Dahlia, a popular ornamental developed from wildflowers (species of Dahlia) found in the mountains of Mexico.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Mar , Apr , May
DistributionUSA: CA Native Distribution:
San Luis Obispo to Los Angeles Cos. & most of the Channel Islands, CA Native Habitat:
Rocky sea cliffs & exposed dunes to 150 ft.
Growing ConditionsLight Requirement:
Sun Soil Description:
Well-drained sands. Conditions Comments:
As the flower
heads go to seed, the plants tend to look untidy. Flower
heads can be cut off. In
dry summers, tree
coreopsis looses its leaves, leaving only bare, green stems. Very drought-tolerant.
Easily grown from seed. Mature plants may be increased by division. Seed Collection:
Not Available Seed Treatment:
Seeds of this genus
generally germinate without pretreatment. Commercially Avail:
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Santa Barbara Botanic Garden
- Santa Barbara, CANative Seed Network
- Corvallis, OR
Record Last Modified: 2009-02-21
Research By: TWC Staff