Plant types and subtypes: Perennials
Light Requirements: sun
Water Use: medium
Soil Moisture: moist
Soil Description: acid, neutral, rich, average, loam, clay, sand
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
Pricing & Availability
Helianthus grosseserratusAlso known as:
Helianthus grosseserratus var. hypoleucus, Helianthus grosseserratus ssp. Maximus, Helianthus instabilis
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.
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
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.
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
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
|Species||Helianthus grosseserratus||sawtooth sunflower|