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PlantFiles: Chinese Delphinium
Delphinium grandiflorum 'Summer Nights'

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

2 vendors have this plant for sale.

7 members have or want this plant for trade.


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


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
This plant is resistant to deer

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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1 positive
1 neutral
1 negative

Gardeners' Notes:

Negative Bazuhi 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.

Positive ms_greenjeans 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.

Neutral berrygirl 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


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

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