Indian Summer

Black-eyed Susan

Velvety petals unfurl in a warm, sunlit blaze—golden to amber—framing a velvety black center that seems to glow from within. Indian Summer Black-eyed Susan forms sturdy, upright clumps with a graceful, airy presence, offering long-lasting blooms with a crisp, daisy-like texture that stands beautifully in the garden. Ideal for beds, borders, and naturalized drifts, it brings effortless color from early season through fall for gardeners who want dependable, showy impact.

Crop Dates

Milestone	Date
Start Indoors	Apr 15th
Last Frost	May 13th
Transplant / Sow Outdoors	May 13th
Harvest Begins	May 13th
Harvest Ends	Sep 27th

Crop Details

Trait	Value
Days to Maturity	N/A
Sun Requirements	Full Sun
Growth Habit	Clumping
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	65
Min Soil Temp (°F)	50
Min Night Temp (°F)	40
Harden Off (days)	7

Frequently Asked Questions

What pest or disease most often affects Rudbeckia hirta (black-eyed Susan), and how can I control it?

Rudbeckia hirta commonly gets powdery mildew in warm, humid weather with poor airflow. Water at the soil line, avoid wetting the leaves, and space plants for airflow; remove heavily infected leaves and improve sun exposure. If it keeps recurring, apply a labeled fungicide made for powdery mildew per the label and repeat as directed.

How often should I water Rudbeckia hirta during the main growing phase, and what soil moisture level should I aim for?

During active growth and bud formation, keep soil evenly moist but not soggy—about 1 inch (2.5 cm) of water per week total, adjusted for rainfall. Water when the top 1 inch of soil feels dry; Rudbeckia tolerates some drought once established, but inconsistent moisture can reduce flowering. Mulch lightly to steady moisture, and ensure drainage so roots don’t sit in water.

How do I tell when Indian Summer (Rudbeckia hirta) is ready to harvest for cut flowers or seed?

For cut flowers, harvest when the ray florets are fully extended and the central disk florets are just beginning to open—blooms should look crisp and freshly colored, not faded. For seed, leave flower heads on the plant until the central disk turns dark and dry and the seeds look firm; cut heads then dry them indoors before separating seeds.