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Rudbeckia hirta (Asteraceae)
A stiff, upright annual or short-lived perennial native to the eastern United States, but has become endemic throughout North America. The Black-Eyed Susan is probably the most common of all American wildflowers. The characteristic brown, domed center is surrounded by bright yellow ray florets. Thrives in most soils in full sun. A true sunshine worshiper that forgives neglect.
Average planting success with this species: 80%
Height: 2-3 feet
Germination: 7-30 days
Optimum soil temperature for germination: 70F
Sowing depth: 1/16"
Blooming period: June-August
Average seeds per pound: 1,710,000
Seeding rate: 2 lbs. per acre
1 oz Covers: 1,361 sq. ft.
Suggested use: Roadsides, open fields, floral gardens, mixtures.
Miscellaneous: The state flower of Maryland. When cut, has a vase life of 6 to 10 days. Reseeds.