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PlantFiles: Meadow Knapweed
Centaurea pratensis

 
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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Centaurea (sen-TAR-ee-uh) (Info)
Species: pratensis (pray-TEN-sis) (Info)

Category:
Perennials

Height:
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

Spacing:
24-36 in. (60-90 cm)

Hardiness:
Unknown - Tell us

Sun Exposure:
Full Sun

Danger:
Unknown - Tell us

Bloom Color:
Magenta (Pink-Purple)
White/Near White

Bloom Time:
Unknown - Tell us

Foliage:
Herbaceous

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

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:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Profile:

No positives
No neutrals
2 negatives

Gardeners' Notes:

RatingAuthorComment
Negative Widget9 On Jul 25, 2009, Widget9 from Battle Ground, WA (Zone 7b) wrote:

This plant is also on the noxious weed list for Clark County in Washington and eradication is required by the land owner. And boy does this stuff spread!

Negative caron On Nov 25, 2004, caron from Woodland Park, CO (Zone 4b) wrote:

Colorado Class A Noxious Weed. Mandatory eradication.
All locations of this plant in Colorado should be immediately reported to the Colorado Department of Agriculture.

Regional...

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

Battle Ground, Washington



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