Plant types and subtypes: Perennials
Light Requirements: sun, part-sun
Water Use: medium
Soil Moisture: moist, wet
Soil Description: acid, loam, clay, sand
Bloom Time: July, August, September, October
Bloom Color: yellow
Leaf Color: green
Hardiness Zone: 4, 5, 6, 7, 8
Additional Tags: attracts bees, attracts birds, cottage garden plant, cut flowers, fall interest, naturalizing, pond margin plant, stream margin plant
Pricing & Availability
Helianthus giganteusAlso known as:
Helianthus alienus, Helianthus borealis, Helianthus subtuberosus, Helianthus validus
Helianthus giganteus produces large plants, ranging from 3' to 9' tall depending on environmental conditions, but despite its specific epithet the flowers are relatively small and rarely exceed 3" in diameter. The flowers are borne on the branched top third of otherwise single, rigid central stems. These flowers are daisy-like, with yellow rays, and brown central disks.
The preference is moist to wet prairies in full sun, or moist open woodlands and margins in part-sun. It does best in well-drained soil that is consistently moist, and is an excellent candidate for use in rain gardens. It does not spread aggressively, but should be given plenty of room due to its sheer size. It enjoy a long blooming period, lasting 2 months during mid-summer to early fall. Zones 3-8
It is easy to propagate by rhizome divisions, but may also be propagated by seed (they require a period of cold stratification, or by stem cuttings taken before the flower buds emerge.
The flowers are very attractive to bees, butterflies, and other pollinators, while the seeds are a food source for many birds and small mammals. Herbivores can be attracted to the foliage.
Native Range & Classification
Recorded County Distribution: USDA data
AL, CT, DC, DE, GA, IA, IL, IN, KY, MA, MD, ME, MI, MN, MS, NC, NJ, NY, OH, PA, SC, TN, VA, VT, WI, WV
USDA Endangered Status:
- Endangered: IL
|Species||Helianthus giganteus||giant sunflower|