Vernonia altissima - Tall Ironweed

Ever seen a Yellow Swallowtail Butterfly on Tall Ironweed? The contrast is spectacular given the purple flowers and this late blooming perennial provides the perfect landing pad.

Tall Ironweed can reach heights over 7 feet tall and blooms July through September. It prefers full sun and moderately damp soils conditions. 

How To Plant Tall Ironweed Seeds:

Direct sow seeds into prepared soil in late fall once soil temps are below 50 degrees (usually mid to late November). Can also be planted in winter during natural freeze/thaw cycles and early spring. Plant shallow, no deeper than 1/8 to 1/4 inch deep and lightly rake to work seed in. Plant in full sun (at least 6 hours a day). Can take 3 growing seasons to fully establish.

What is Stratification?

Seed Info

Seed Envelopes contain approximately 0.02 ounces of seed and cover about 5 to 10 square feet. 

Product Details 

Flower Color: Purple

Height: 4 to 7 Feet

Light Requirements: Full Sun to Shade

Soil Hydrology: Mesic to Wet Soils

Bloom Time: July through September

Plant Type: Perennial

Stratification: Cold Moist (CM) 60 Days

Attracts: Bees, Butterflies