Helenium autumnale - Dogtooth Daisy
A tall growing plant with bright yellow flowers in the fall. Great for that full sun, wet area you may have. Can reach 5-6' in the right conditions. Petals have distinct tooth-like indentations, hence the common name, Dogtooth Daisy. Their blooms are visited by many pollinators.
Full Sun, Wet Soil, Fall, 3-6' Tall, Zones 4-9