Photo by Melody
It's time now to VOTE in our 14th annual photo contest! Voting ends November 7, so be sure to cast your votes for your favorites in each category here. Good luck to all contestants!

PlantFiles: Cornflower, Knapweed
Centaurea simplicicaulis

bookmark
Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Centaurea (sen-TAR-ee-uh) (Info)
Species: simplicicaulis (sim-plik-ee-KAW-liss) (Info)

3 members have or want this plant for trade.

Category:
Perennials

Height:
6-12 in. (15-30 cm)

Spacing:
6-9 in. (15-22 cm)

Hardiness:
USDA Zone 4b: to -31.6 C (-25 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)
USDA Zone 9a: to -6.6 C (20 F)

Sun Exposure:
Full Sun

Danger:
Unknown - Tell us

Bloom Color:
Violet/Lavender

Bloom Time:
Mid Summer

Foliage:
Herbaceous
Silver/Gray

Other details:
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

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 seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

Click thumbnail
to view:

By growin
Thumbnail #1 of Centaurea simplicicaulis by growin

By growin
Thumbnail #2 of Centaurea simplicicaulis by growin

By bonehead
Thumbnail #3 of Centaurea simplicicaulis by bonehead

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive bonehead On Oct 19, 2009, bonehead from Cedarhome, WA (Zone 8b) wrote:

Clear pink thistle like flowers in July. I have this tucked between a daylilly and earlier cornflower, for a nice combo. After bloom, I cut the whole plant back hard, and it often reblooms. It does occasionally get powdery mildew.

Regional...

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

Brea, California
Columbus, Ohio
Stanwood, Washington



We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2014 Dave's Garden, an Internet Brands company. All Rights Reserved.
 

Hope for America