Rudbeckia, Sweet Black-Eyed Susan, Sweet Coneflower
Rudbeckia subtomentosa 'Henry Eilers'

Family: Asteraceae (ass-ter-AY-see-ee)
Genus: Rudbeckia (rud-BEK-ee-a)
Species: subtomentosa (sub-toh-men-TOH-suh)
Cultivar: Henry Eilers


Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

Sun Exposure
Full Sun
Sun to Partial Shade


Foliage Color

4-6 ft. (1.2-1.8 m)

24-36 in. (60-90 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Where to Grow
Grow outdoors year-round in hardiness zone
Can be grown as an annual


Bloom Color
Gold (yellow-orange)

Bloom Characteristics
Flowers are good for cutting
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant

Bloom Size

Bloom Time
Mid Summer
Late Summer/Early Fall
Mid Fall

Other details

Soil pH requirements
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information

Propagation Methods
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; direct sow after last frost

Seed Collecting