Coreopsis gigantea (Kellogg) H.M. Hall
Giant Coreopsis, Giant Tickseed, Tree Coreopsis
Asteraceae (Aster Family)
Synonym(s): Leptosyne gigantea, Tuckermannia gigantea
USDA Symbol: COGI
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.
From the Image Gallery
Bloom InformationBloom Color: Yellow
Bloom Time: Mar , Apr , May
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.
PropagationDescription: 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: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Santa Barbara Botanic Garden - Santa Barbara, CA
Native Seed Network - Corvallis, OR
BibliographyBibref 995 - Native Landscaping from El Paso to L.A. (2000) Wasowski, S. and A. Wasowski
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Additional resourcesUSDA: Find Coreopsis gigantea in USDA Plants
FNA: Find Coreopsis gigantea in the Flora of North America (if available)
Google: Search Google for Coreopsis gigantea
MetadataRecord Modified: 2009-02-21
Research By: TWC Staff