Chinese Delphinium 'Summer Nights'

Delphinium grandiflorum

Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Delphinium (del-FIN-ee-um) (Info)
Species: grandiflorum (gran-dih-FLOR-um) (Info)
Cultivar: Summer Nights



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


12-15 in. (30-38 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 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)

Sun Exposure:

Full Sun

Sun to Partial Shade


All parts of plant are poisonous if ingested

Bloom Color:

Dark Blue

Bloom Time:

Late Summer/Early Fall



This plant is resistant to deer

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:


Des Plaines, Illinois

Downers Grove, Illinois

Machesney Park, Illinois

Rockford, Illinois

Sioux Center, Iowa

South Amana, Iowa

Lowell, Massachusetts

Saginaw, Michigan

Hopkins, Minnesota

Lima, Ohio

Norristown, Pennsylvania

Palmyra, Virginia

Vancouver, Washington

show all

Gardeners' Notes:


On Jun 9, 2011, Bazuhi from Downers Grove, IL (Zone 5a) wrote:

I saw this plant in 2008 at the local Home Depot and loved the looked from a distance BLUE... I bought a bunch and the supply was limited.. after first planting them I had to replace them several times before giving up. The plants all turned black and died. I gave up on this plant.


On Nov 9, 2010, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I happen to like the color blue, and it is difficult to find perennials that provide such a color. Summer Nights is a beautiful blue color and has a long bloom time. This is a hardier plant than I expected as well, since it has quite a delicate appearance.


On Mar 21, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Short 18"- Plant 18" apart. Zone 3-8 Excellent heat tolerance. Deep blue flowers. Hailing from China.

Blooms: Late Spring, Early summer to Late Summer, Early Fall

Flower Color: Blue

Sun-Shade: Full Sun to Half Sun/ Half Shade

Accent Color: Blue

Soil Condition: Normal

Plant Height: Short

Zones: z3,z4,z5,z6,z7,z8