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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    (0 of 5)
Other Uses    (1 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care (info)
Frost Hardy Well drained soil Moist Soil Full sun
Coreopsis gigantea Giant coreopsis, Sea Dahlia


http://commons.wikimedia.org/wiki/User:Stan_Shebs
Coreopsis gigantea Giant coreopsis, Sea Dahlia
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Summary

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


Physical Characteristics

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

UK Hardiness Map US Hardiness Map

Synonyms

Leptosyne gigantea.

Plant Habitats

 Cultivated Beds;

Edible Uses

None known

References   More on Edible Uses

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

References   More on Medicinal Uses

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Other Uses

Dye

An orange to red/orange dye is obtained from the flowers and stems[168].

Special Uses

Attracts Wildlife

References   More on Other Uses

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.

References   Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:

Fahrenheit:

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The PFAF Bookshop

Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees,Edible Shrubs, Woodland Gardening, and Temperate Food Forest Plants. Our new book is Food Forest Plants For Hotter Conditions (Tropical and Sub-Tropical).

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Plant Propagation

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

If available other names are mentioned here

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 NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Coreopsis auriculataTickseed, Lobed tickseed,Mouse-eared Coreopsis, Eared CoreopsisPerennial1.5 4-8 MLMNDM003
Coreopsis calliopsideaLeafstem tickseedAnnual0.6 0-0  LMNDM001
Coreopsis roseaPink tickseedPerennial0.6 4-9 FLMSNDMWe003
Coreopsis tinctoriaCoreopsis, Golden tickseed, Atkinson's tickseed, Dyer's Coreopsis, Plains Coreopsis, Annual CoreopsAnnual0.8 2-11 MLMNDM111
Coreopsis tinctoria atkinsonianaCoreopsisAnnual0.6 -  LMNDM112
Coreopsis verticillataWhorled tickseedPerennial1.0 3-9 FLMNDM113

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

Expert comment

Author

(Kellogg.)Hall.

Botanical References

71200

Links / References

For a list of references used on this page please go here

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