Saw-tooth Sunflower is a magnificent, colony-forming perennial that brings architectural height and vibrant color to moist prairie landscapes. Reaching anywhere from 3 to 15 feet in height, this species is easily identified by its smooth, reddish-purple stems and large, bright yellow flowerheads that bloom from August through October. Despite its common name, the leaves are only slightly serrated, but they provide essential forage for the caterpillars of Silvery Checkerspot and Gorgone Checkerspot butterflies. Native to the central and eastern U.S., it flourishes in full sun and organic-rich, moist soils. It is a vital resource for long-tongued bees, bumblebees, and beneficial wasps, while its abundant seed crop feeds goldfinches and other songbirds throughout the fall. Due to its vigorous rhizomatous growth, it is ideal for erosion control and large naturalized areas. Seeds benefit from a 30-day cold-moist stratification (C30) to break dormancy and ensure a successful spring start.

Quick facts

• Height: 3–15 ft
• Sun: Full to Partial
• Soil moisture: Medium-Wet to Medium-Dry
• Bloom time: Aug–Oct (Yellow)
• Life cycle: Perennial
• Notes: Aggressive, Rhizomatous
• Native range: Native to 34 states, including Iowa, Minnesota, Wisconsin, Illinois, Missouri, Nebraska

See the full growing guide and county range map for Saw-tooth Sunflower