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Helianthus grosseserratus

sawtooth sunflower add to wishlist

Plant types and subtypes: Perennials

Light Requirements: sun

Water Use: medium

Soil Moisture: moist

Soil Description: acid, neutral, rich, average, loam, clay, sand

Height: 5'-10'

Bloom Time: July, August, September, October

Bloom Color: yellow, orange

Leaf Color: green

Hardiness Zone: 3, 4, 5, 6, 7, 8

Additional Tags: attracts bees, attracts birds, attracts butterflies, clumping, colonizing, cut flowers, naturalizing

Helianthus grosseserratus (sawtooth sunflower)
  • Helianthus grosseserratus (sawtooth sunflower)
  • Helianthus grosseserratus (sawtooth sunflower)
  • Helianthus grosseserratus (sawtooth sunflower)

Pricing & Availability

Description

Helianthus grosseserratus

Also known as:

sawtooth sunflower

,

Scientific Synonyms:

Helianthus grosseserratus var. hypoleucus, Helianthus grosseserratus ssp. Maximus, Helianthus instabilis

Description

Helianthus grosseserratus is quite an impressive species that will easily grow to a height of 10', or more, under ideal conditions. The stems are robust, usually tinged with purplish hues, and branching on their upper portion. The leaves are up to 8" long, lance-shaped, and for the most part conspicuously serrated hence the common name sawtooth sunflower. It is a prolific bloomer, producing loose clusters of yellow, up to 4" in diameter sunflowers. Bloom period begins in late summer, and lasts about 2 months.

Cultivation

Sawtooth sunflowers are easy to grow in rich, moist, well-drained soil in full sun. It does however tolerate poorer soils, and is often found growing in disturbed areas. It may be vulnerable to powdery mildew in areas that are too wet, but this usually occurs at the end of the growing season and doesn't affect the overall health of the plant. Under ideal conditions, it will spread rapidly via its rhizomatous root system. Because of this tendency, and also its considerable height, be sure to plan on giving it plenty of room. Very cold hardy, and somewhat tolerant of hot climates. Zones 3-8

Propagation

Easy to propagate from seed. These should be sowed directly outdoors in fall. Stored seeds will require a 2 month period of cold stratification before sowing in spring. May also be propagated by dividing rhizomes in fall, or basal cuttings in spring.

Additional Notes

Helianthus grosseserratus is a valuable species to many forms of wildlife, from pollinators, to birds and small mammals that feast on the seeds in fall.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:
AR, CT, DE, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, ND, NE, NH, NJ, NM, NY, OH, OK, PA, SD, TN, TX, VA, WA, WI, WV

Classification

Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae Aster family
Genus Helianthus sunflower
Species Helianthus grosseserratus sawtooth sunflower