The genus Helianthus also includes a number of perennial species. These are fairly long-blooming, late-season flowers, blooming in late summer through mid autumn. Though the flowers tend to be smaller than annual sunflowers, they make up for it with weeks of showy color. Perennial sunflowers range in height from 2 to 10 feet tall. They tend to grow either as clumps, or from rhizomes, which tend to spread quite aggressively in the garden. They are generally heat and drought tolerant, and, as many are native to bogs and prairies, are not too fussy about soil. Their dark green leaves create a striking contrast with the bright yellow flowers, and they attract a variety of pollinators.

Perennial Sunflower Growing Tips

Perennial sunflowers are tolerant of many soil conditions, but do best in soil with organic matter and good drainage. Clay soils may cause problems with perennial sunflower varieties that tend to be invasive (like Jerusalem artichokes). Growing from seed is not always practical as many of the varieties are hybrids. Divisions from existing plants are the best way to propagate. This may be done in spring or fall. The rhizomes spread relatively fast: leave 2 to 3 feet of space around divisions to give them room to spread. Although they are relatively low maintenance plants, some taller varieties may need staking, or can be planted alongside a garage or wall behind other tall perennials for support. Cut them back in the spring and clear away debris. Perennial sunflowers are resistant to most pests. Their only real issue can be powdery mildew, partly because they increase quickly and create a crowded flower bed space. Dividing them every other year to manage size and increase air flow is helpful.

Native Area: Southeast US, Florida, AlabamaUSDA Growing Zones: 6-9Height: 6-9 feetSun Exposure: Full sun

Native Area: Eastern Canada and USUSDA Growing Zones: 3-9Height: up to 9 feetSun Exposure: Full sun

Native Area: Eastern and central USUSDA Growing Zones: 3-9Height: 2-4 feetSun Exposure: Full sun

Native Area: Mostly Central and Southeast US, has naturalized in Northwest USUSDA Growing Zones: 4-10Height: 2-3 feetSun Exposure: Full sun

Native Area: US and CanadaUSDA Growing Zones: 4-8Height: 6-7 feetSun Exposure: Full sun

Native Area: US and CanadaUSDA Growing Zones: 4-9Height: 3-10 feetSun Exposure: Full sun

Native Area: Central USUSDA Growing Zones: 4-9Height: 10 feet or tallerSun Exposure: Full sun

Native Area: Naturalized throughout Eastern and Central USUSDA Growing Zones: 3-9Height: 6-10 feetSun Exposure: Full sun

Native Area: Eastern US and coastal areasUSDA Growing Zones: 8-11Height: 1-3 feetSun Exposure: Full sun

Native Area: Central and Eastern US, CanadaUSDA Growing Zones: 4-8Height: 4-6 feetSun Exposure: Full sun