Black-Eyed Susan (Rudbeckia) Growing Guide: Sunny, Tough, and Pollinator-Friendly

Native to North America, black-eyed Susans (Rudbeckia hirta) are beloved wildflowers that blanket fields with golden-yellow, daisy-like blooms from June to October. The “black eye” is the dark brown-purple center. Plants reach over 3 feet tall with 2–3 inch flowers. Butterflies, bees, and other pollinators flock to them for nectar, transferring pollen as they feed. Note: they can be aggressive, crowding out neighboring plants.

Planting

• Soil temperature: Sow when soil reaches 70°F (typically March–May in much of North America).
• Germination: 7–30 days.
• Soil: Moist, well-drained; fertile preferred but tolerates tough conditions.
• Sun: Full sun best; tolerates partial sun.
• Sowing: Scatter seeds on loosely covered soil.
• Spacing: 12–18 inches apart. Closer spacing limits spread; wider creates a border.

Care

• Water regularly; don’t let plants dry out.
• Divide perennial types every 3–4 years to maintain health and control spread.
• Deadhead faded flowers to prolong blooming.
• Cut back after flowering; a second, smaller flush may appear in late fall.

Pests & Diseases

• Powdery mildew (start organic antifungal program if lower leaves brown and twist)
• Slugs, snails, aphids
• Rust, smut, leaf spots
• Deer-resistant

Harvest & Storage

After the first season, plants often self-seed readily.

Recommended Varieties

• ‘Becky Mixed’ – lemon-yellow, golden-yellow, dark red, reddish-brown
• ‘Sonora’ – bright yellow
• ‘Toto’ – dwarf type, ideal for containers

Wit & Wisdom

Black-eyed Susans symbolize justice.