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

Rudbeckia hirta

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Rudbeckia (rud-BEK-ee-a) (Info)
Species: hirta (HER-tuh) (Info)
Cultivar: Denver Daisy

Category:

Annuals

Biennials

Perennials

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun

Sun to Partial Shade

Foliage:

Herbaceous

Foliage Color:

Unknown - Tell us

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)

Where to Grow:

Can be grown as an annual

Danger:

Unknown - Tell us

Bloom Color:

Gold (yellow-orange)

Brown/Bronze

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Other details:

Unknown - Tell us

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

show all

Gardeners' Notes:

3
positives
1
neutral
0
negatives
RatingContent
Positive

On Jul 18, 2020, theflowerlady12 from Kokomo, IN wrote:

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, some plants have a deeper yellow in the center, some have various patterns of red in them some have large petals, some are smaller...if I support them early, they bloom a long time.

Neutral

On Jun 5, 2016, DaylilySLP from Dearborn Heights, MI (Zone 6a) wrote:

Named to commemorate the city of Denver, Colorados 150th anniversary in 2008.

Positive

On Jul 24, 2015, vossner from East Texas,
United States (Zone 8a) wrote:

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. Goldstrum. Nice display with different yet similar blooms.

Positive

On Jul 2, 2012, patchisback from Mantua, NJ wrote:

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 plant with large multiple petaled flowers, not doubles, but triple layers of bright yellow petals with red or rust near center. The petals are very narrow and are unlike the wide petals of most Denver Daisy's. I do not know if this is a freak variety or a legitimate new flower form. Has anyone had any experiences like this with this variety?

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