Coreopsis gigantea - (Kellogg.)Hall.
Common Name Giant coreopsis, Sea Dahlia
Family Asteraceae or Compositae
USDA hardiness 10-11
Known Hazards None known
Habitats By the coast on rocky sea cliffs and exposed dunes to 50 metres in California[71].
Range South-western N. America.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Frost Hardy Well drained soil Moist Soil Full sun

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Bloom Color: Yellow. Main Bloom Time: Early fall, Late summer, Mid summer. Form: Irregular or sprawling.

Coreopsis gigantea Giant coreopsis, Sea Dahlia
Coreopsis gigantea Giant coreopsis, Sea Dahlia
Physical Characteristics
 icon of manicon of flower
Coreopsis gigantea is a PERENNIAL growing to 2.5 m (8ft 2in) at a medium rate.
It is hardy to zone (UK) 8. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees.It is noted for attracting wildlife.
Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought. The plant can tolerate maritime exposure.

Leptosyne gigantea.

 Cultivated Beds;
Edible Uses
None known
Medicinal Uses
Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

None known


Other Uses

An orange to red/orange dye is obtained from the flowers and stems[168].
Cultivation details
Landscape Uses:Border, Container, Foundation, Seashore, Specimen. Succeeds in ordinary garden soil[1]. Prefers a fertile well-drained moisture retentive medium soil[111, 200]. Requires a sunny position[111, 200]. Established plants are drought resistant[1]. This species is not very cold hardy in Britain, tolerating temperatures down to about -3°c[200, 260]. It dislikes winter wet and so is also apt to die out over the winter if grown on clay soils[111]. It is best grown in a greenhouse in this country[1]. The cut flowers last well in water[260]. The flowers are loved by bees[260]. Special Features:Attracts birds, Attractive foliage, North American native, Attracts butterflies, Suitable for cut flowers.
Seed - sow March in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out into their permanent positions in the summer[111]. The seed can also be sown in an outdoor seedbed in mid spring. Once they are more than 15cm tall, plant the seedlings out into their permanent positions in the summer. Division in spring or autumn[111]. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the summer or following spring. Cuttings of young basal shoots, May/June in a frame[200]. Harvest the shoots when they are about 10cm long with plenty of underground stem. Pot them up into individual pots and keep them in light shade in a cold frame or greenhouse until they are rooting well. Plant them out in the summer.
Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Coreopsis auriculataTickseed, Lobed tickseed,Mouse-eared Coreopsis, Eared Coreopsis00
Coreopsis calliopsideaLeafstem tickseed00
Coreopsis tinctoriaCoreopsis, Golden tickseed, Atkinson's tickseed, Dyer's Coreopsis, Plains Coreopsis, Annual Coreops11
Coreopsis tinctoria atkinsonianaCoreopsis11


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Subject : Coreopsis gigantea  

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