GENERAL INFORMATION
Scientific Name: Rudbeckia hybrida
CommonName: Black Eyed Susan
Hardiness Zone: 5a - 8b
Blooming Season: Summer, Late Summer
Plant Habit: Columnar
Characteristics: Attracts Butterflies, Deer Resistant
Water: Light
Fertilizer: None or when needed only
Spacing: 22 - 26" (56 - 66cm)
Height: 30 - 34" (76 - 86cm)
Width: 20 - 24" (51 - 61cm)
Exposure: Sun
PROPAGATION
Media EC/pH: EC 0.75-0.80 mmhos/pH 6.0-6.4
Soil Temperature: 70-74°F (21-23°C)
Rooting Hormone: None
Mist: Very low mist. Prefers high humidity only.
Fertilization: 50-75 ppm N starting day 7
Pinching: None
Transplanting: 35-42 days after sticking
FINISHING
Media pH: 6.0-6.4
Temperature: Nights: 60 to 65°F (16 to 17°C) Days: 65 to 80°F (17 to 27°C)
Light Level (fc): 5,000 to 9,000
Vernalization: No
Daylength: Long day obligate
Watering: Moderate; avoid wilting.
Fertilization: Use a balanced fertilizer at a rate of 150 to 175 ppm.
Pinch After Transplant: No
Plant Growth Regulators: B-Nine/Cycocel combination at 3,750 ppm/500 ppm can be used to tone foliage. May delay flowering. Sumagic sprays after flower initiation if needed.
Pests and Fungal Diseases: Aphids, leaf miners, leaf spot
CROP SCHEDULING
1–qt. (10–cm) pot, 1 plant per pot: Not recommended
1–gal. (15–cm) pot, 1 plant per pot: 12-14 wks
2 to 3–gal. (25 to 30–cm) pot, 3 plants per pot: 12-14 wks
Bloom Months: Late June to September