University of Wisconsin-Madison | Botany Plant Growth Facilities

Botanical Garden

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Genus: Rudbeckia Species & Cultivars: fulgida 'Goldstrum' & hirta Common Name: Eastern Coneflower & Black-Eyed Susan Family: Asteraceae Order: Asterales Native: Eastern United States Habit: Herbaceous Perennial Height: 2 to 4 feet Width: 1 to 2.5 feet Season: Summer Flower Color: Brown (disc flowers) and Orange-yellow (ray flowers) Propagation: Seed and division Zone: Hardy to zone 3 Alternate species: R. maxima Note: These plants are suitable as cut flower gardens, in meadows, perennial borders and cottage gardens. Black-Eyed Susan can tolerate drought, heat and a variety of soil conditions. Pinch the spent flowers of this clump-forming rhizomatous plant in order to enhance, and prolong flowering. Monitor for slugs, snails and powdery mildew. Black-Eyed Susan can self-seed, and often becomes invasive. Prefers sunny, moderately dry, well-drained, ordinary garden soil.