How to grow swamp sunflower

When to plant swamp sunflower

A tall, aggressive perennial that prefers moist to occasionally wet acidic soils in full sun and flowers better in sun than in part shade. Propagate by division, root cutting, or seed, prune it back in June to encourage branching, and give it room to spread. It blooms from late summer into fall.

Swamp Sunflower is timed by season rather than your frost dates, so the planting calendar does not generate ZIP-specific dates for it. Check the cited sources below to fine-tune for your area.