Hardiness: 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
Danger: 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
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 color..it 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
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 Elida, Ohio East Norriton, Pennsylvania Lake Monticello, Virginia Vancouver, Washington