Black-Eyed Susan
Rudbeckia hirta
Native wildflower with bright yellow petals and dark centers.
Care Instructions
Extremely drought-tolerant once established. Water new transplants weekly for the first month. After establishment, rainfall is usually sufficient except during prolonged drought.
Full sun preferred (6+ hours). Tolerates light shade but blooms are reduced. Best color in full sun exposures.
Thrives in poor to average, well-drained soil. Does NOT need rich soil — over-fertilizing causes floppy stems and fewer flowers. pH 6.0–7.0.
Seasonal Guide
Best Planting Time
Direct sow seed in early spring (after last frost) or fall. Transplant established plants in spring or early fall.
Bloom / Growth Season
Flowers July through October. Self-seeds prolifically — allow seedheads to remain for natural spreading and winter bird food.
Dormancy
Dies back to ground after frost. Perennial roots survive; new growth emerges in April. Leave stems standing for wildlife.
Common Problems & Solutions
Powdery mildew (white coating on leaves)
Improve air circulation by spacing plants 18 inches apart. Apply potassium bicarbonate or diluted neem oil spray.
Crown rot from overwatering
Ensure excellent drainage. Avoid mulching directly against the crown. Reduce watering frequency.
Aphid clusters on new growth
Blast off with a strong water stream. Introduce ladybugs or lacewings. Insecticidal soap as last resort.
Plant Details
USDA Zones
3a, 3b, 4a, 4b +9
Maintenance
low
Mature Height
1-3 ft
Native Regions
North America
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