Rudbeckia, Black-Eyed Susan, Gloriosa Daisy 'Denver Daisy'

Rudbeckiahirta

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Rudbeckia (rud-BEK-ee-a)
Species
hirta (HER-tuh)
Synonym
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Herbaceous
Height
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
Spacing
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)
Hardiness
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)
Bloom Color
Gold (yellow-orange)
Brown/Bronze
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Other Details
Category
Annuals
Biennials
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Can be grown as an annual
Bloom Characteristics
Flowers are good for cutting
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
By dividing the rootball
From herbaceous stem cuttings
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Regional

This plant is said to grow outdoors in the following regions:

Delta, Colorado

Fort Lauderdale, Florida

Newnan, Georgia

Chicago, Illinois

Pacific Junction, Iowa

Norfolk, Nebraska

Mantua, New Jersey

Anthony, New Mexico

Black Mountain, North Carolina

Columbus, Ohio

Bolivar, Tennessee

Spring Hill, Tennessee

Lewisville, Texas

Oakwood, Texas

Richmond, Texas

Spring, Texas

Tyler, Texas

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Gardener's Notes:

3
positives
1
neutral
0
negative
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T
Kokomo, IN | July 2020 | positive

I love this plant...it is an annual in my zone 5 Indiana garden but it self-seeds abundantly. many variations on color and size, doubles...Read More

D
Dearborn Heights, MI (Zone 6a) | June 2016 | neutral

Named to commemorate the city of Denver, Colorado’s 150th anniversary in 2008.

V
(Zone 8a) | July 2015 | positive

Planted in 2015 so no invasiveness issues so far. Lovely dark eye, I have it planted in close proximity to r. Indian Summer and r. Golds...Read More

P
Mantua, NJ | July 2012 | positive

This is an incredibly vigorous plant. I have had no problems with it at all. The blooms are very large and brightly colored. I have one ...Read More

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