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Rudbeckia amplexicaulis (Asteraceae)
A hardy annual native to the southeastern United States, and has naturalized throughout most of North America. The identifiable black, cone-shaped heads are surrounded by bright yellow, drooping reflexed ray flowers. Prefers full sun in various soil conditions. Often forms dense colonies in moist areas.
Average planting success with this species: 80%
Height: 1 1/2-2 feet
Germination: 7-30 days
Optimum soil temperature for germination: 70F
Sowing depth: 1/16"
Blooming period: June-September
Average seeds per pound: 800,000
Seeding rate: 3 lbs. per acre
1 oz Covers: 908 sq. ft.
Suggested use: Roadsides, prairies, waste places, slopes.
Miscellaneous: A very heavy reseeder. Another wonderful variety for cut arrangements.