Rudbeckia Seeds - Black-Eyed Susan


Rudbeckia hirta

A cottage garden favorite for its easy to grow habit and ability to produce hundreds of blooms over the summer and fall. Excellent cut flower with up to 10 days of vase life. Plants grow 2-3'. Self-seeding biennial or hardy annual. Seeds must be cold stratified for best germination. Full sun. Hardy to zone 3.

  • Planting Information
  • Growing Information
  • Seed Saving Information


Average Seed / ozSeed / 100' RowAverage Yield / 100' RowDays to Harvest
Planting SeasonIdeal Soil TempSunFrost Tolerance
After Last Frost60°FFull/PartFrost Sensitive
Sowing MethodSeed DepthDirect Seed SpacingSeeds Per Packet
Transplant or Direct SeedsurfaceN/A1100
Mature SpacingDays to SproutProduction CycleSeed Viability
12-18"5-21Annual2-3 years

Bed Preparation


Black-Eyed Susan is an annual that prefers rich, well-drained soil, but will tolerate average soils. Choose a site with full sun to partial shade.




Seeds need a period of cold, moist conditions for optimal germination. Direct sow outdoors in fall or stratify seed in a refrigerator for 3-4 weeks before sowing in the spring. Sow seeds on the soil surface and press lightly to settle. Seeds will sprout in 5-21 days. Thin seedlings so that mature plants are 12-18" apart.

Keep adequately moist for the first year of growth until plants become well established. Heat and drought tolerant once established.



Black-Eyed Susan is a prolific bloomer and cut flowers can be harvested from summer-fall.


Seed Saving


Black-Eyed Susan is a self-seeding annual whose seed matures in late summer/fall. Seed is ready to harvest when dry and brown. Store seeds in a cool, dry place. Seeds are viable for 2-3 years.