Helianthus giganteus Giant sunflower (Compositae)

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Helianthus giganteus
Giant sunflower
(1 Page of 5)

The Helianthus giganteus plant species is found in N. America - Maine and Ontario to Saskatchewan, Florida, Louisiana and Colorado. It is a member of the Compositae family. Common gardeners may know the plant as Giant sunflower. Some home gardeners know the variety as H. altissimus. H. decapitalus sulphureus elatior.

Cultivation | Propagation | General Uses
Medicinal | Edible Uses

Latin Name:  Helianthus giganteus
Common Name:  Giant sunflower
Family:  Compositae
Author:  L.

Known Hazards:  None known

Mature Height:  3.6   Mature Width:

Habitat:  Damp or rich thickets, swampy woods and clearings[43].

Propagation Notes: Seed - sow spring in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Division in spring or autumn. 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 spring. Basal cuttings in spring. Harvest the shoots when they are about 10 - 15cm 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.

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Cultivation | Propagation | General Uses
Medicinal | Edible Uses

The information above has been supplied solely via the hard work and dedication of the team at 'Plants for a Future'.
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