Rudbeckia hirta


Rudbeckia hirta flowerhead


Plant Characteristics
Cultivation
Scientific Names

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Rudbeckia hirta (Black-eyed Susan, Blackiehead, Brown Betty, Brown Daisy, Brown-eyed Susan, Gloriosa Daisy, Golden Jerusalem, Nigger Daisy, Poorland Daisy, Yellow Daisy, Yellow Ox-eye Daisy) is a flowering plant in the family Asteraceae. It is an upright annual (sometimes biennial or perennial) native to most of North America, and is one of a number of plants with the common name Black-eyed Susan that also has purple on the side.

The plant can reach a height of 1-2 m. It has alternate, mostly basal leaves 20-75 cm long, covered by coarse hair. It flowers from June to August, with inflorescences measuring 10-15 cm in diameter (up to 30 cm in some cultivars), with yellow ray florets circling a brown, domed center of disc florets.


Read about Rudbeckia hirta in the Standard Cyclopedia of Horticulture 

Rudbeckia hirta, Linn. Black-eyed Susan. Yellow daisy. Biennial or annual, 1-3 ft. high, simple or branched, hispid: lvs. 2-5 in. long: rays golden yellow, sometimes orange at base. Dry and open ground; common over wide range and often rather a troublesome weed.—R. conspicua, Hort., is probably only a garden form with long narrow orange-yellow ray-florets and a black disk. Var. vomerensis, Hort., differs from the type in having larger fl.-heads with broad ray-fls. which are light canary to golden yellow.


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Cultivation

Propagation

Pests and diseases

Varieties

There are four varieties:

  • Rudbeckia hirta var. angustifolia. Southeastern United States (South Carolina to Texas).
  • Rudbeckia hirta var. floridana. Florida, endemic.
  • Rudbeckia hirta var. hirta. Northeastern United States (Maine to Alabama).
  • Rudbeckia hirta var. pulcherrima. Widespread in most of North America (Newfoundland to British Columbia, south to Alabama and New Mexico; naturalized Washington to California).

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References

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