Photo by Melody

PlantFiles: Mountain Cornflower, Mountain Bluet, Perennial Cornflower
Centaurea montana 'Dot Purple'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Centaurea (sen-TAR-ee-uh) (Info)
Species: montana (MON-tah-nuh) (Info)
Cultivar: Dot Purple

One member has or wants this plant for trade.


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

15-18 in. (38-45 cm)
18-24 in. (45-60 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 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)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Late Fall/Early Winter


Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

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:
By dividing the rootball
From seed; direct sow outdoors in fall

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

Click thumbnail
to view:

By DiOhio
Thumbnail #1 of Centaurea montana by DiOhio

By gardeningfun
Thumbnail #2 of Centaurea montana by gardeningfun

By gardeningfun
Thumbnail #3 of Centaurea montana by gardeningfun


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive gardeningfun On Jan 3, 2011, gardeningfun from Harpersfield, OH (Zone 5a) wrote:

Mine is not called "dot purple", just Centaurea Montana; so I am not sure this is exactly it; but I love it. I live in zone 5a in very heavy clay. We have really high winds with no protection; blizzards, heavy rains and then no rain and it does fantastic! This is it's 3 or 4th year. I bought 2 of this one and one of the Gold Bullion (you can see it in the picture beside it- the Gold Bullion is lighter green and hadn't bloomed yet; the Montana is blooming a lot in the picture). They cost $1.33 or close to that at Bluestone Perennials in Madison, Ohio. They come as tiny little plants that i didn't have much hope for and have exceeded my expectations! They aren't tall and should be in the front of my garden instead of behind the Obedient plants, but I had no idea what the Obedient plants were and they were tiny babies, too.
They do REBLOOM in fall! Also, they get around 1-2' tall.


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

Colorado Springs, Colorado
Geneva, Ohio

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