Photo by Melody

PlantFiles: Mountain Cornflower, Mountain Bluet, Perennial Cornflower
Centaurea montana 'Coerulea'

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

6 members have or want this plant for trade.

Category:
Unknown - Tell us

Height:
18-24 in. (45-60 cm)

Spacing:
18-24 in. (45-60 cm)

Hardiness:
USDA Zone 5b: to -26.1 C (-15 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Danger:
Unknown - Tell us

Bloom Color:
Blue-Violet

Bloom Time:
Mid Spring
Late Spring/Early Summer

Foliage:
Velvet/Fuzzy-Textured

Other details:
Unknown - Tell us

Soil pH requirements:
Unknown - Tell us

Patent Information:
Non-patented

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
Direct sow as soon as the ground can be worked
From seed; sow indoors before last frost
From seed; direct sow after last frost
From seed; germinate in a damp paper towel
From seed; germinate in vitro in gelatin, agar or other medium

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

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There are a total of 14 photos.
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Profile:

4 positives
1 neutral
2 negatives

Gardeners' Notes:

RatingAuthorContent
Negative JanFRN On Jul 11, 2012, JanFRN from St. Albert
Canada wrote:

This is one of the weediest plants I've ever had in my garden. I deeply regret the purchase of two of these that became parents-of-millions. They grow in my lawn, they grow in the neighbours' yards, they've crowded out my rock garden plants... and they think Round-Up is Miracle Grow. I'm going to be cutting down and digging out for years.

Positive Bazuhi On May 27, 2011, Bazuhi from Downers Grove, IL (Zone 5a) wrote:

This was planted in my garden in 2008 given to me by a friend so not sure of the exact cultivator but it is growing with great success. I have it in both full sun and part-shade and all are doing well with many blooms.. Today is May 27th and the plant is in full bloom with many more blooms to come! This plant transplants easy so you can give small ones away to friends and at times there are many to give away! After quite a few years of growing this plant it has done exceptionally well!! I find small plants here and there more then not from seeds being dropped by the birds. I have shared this plant with so many people who also love it!! One down fall of this plant is when it gets tall it will have the tendency to fall over after a while especially when there is no rain and not enough water.
Secets are:
1)Dead head!! You will get many more blooms come up and the bloom time will last quite a bit longer.
2)After second set of blooms allow the seed heads to sit on top and dry naturally, you will then witness tons of finches all over your plants.
3)After the plant looks really terrible and falling over watch for new growth at the base, when you see the new growth go ahead and cut away the old growth. I have not gotten another bloom from the new growth till the following year.

Neutral Susini On Aug 11, 2010, Susini from Lake Park, MN wrote:

Bushy plant in the spring, peony-like as one commenter said. I'm not a fan of the foliage come mid-summer. I wouldn't say it's ratty, but it sort of withers. Self-sows easily and reblooms if cut back. I'd love the plant if the foliage stayed pretty.

Positive kobwebz On Jun 1, 2010, kobwebz from columbia, TN (Zone 7a) wrote:

Love this plant. some get to be as big and full as peony bushes, self sows alot, easy to move around in early spring..

Positive bonehead On Nov 18, 2009, bonehead from Cedarhome, WA (Zone 8b) wrote:

I also experience problems with mildew. The answer for me is to cut them back hard when about through blooming (end of June). They fill back in quickly and give me a second bloom in September. And, yes, they reseed like crazy, but are easy to pull out where unwanted.

Positive JustMe48 On May 25, 2009, JustMe48 from Rochester, NY (Zone 6a) wrote:

Mine are not ratty looking and I have no problem with moldew or mold in my area. They add pretty blue/purple color to my garden.

Negative anelson77 On May 12, 2009, anelson77 from Seattle, WA wrote:

These are weedy and very hard to get rid of, with deep roots and the ability to regrow from a fragment. They reseed like crazy. Also, they get mildewy and ratty looking in mid summer.

On the plus side, they do look pretty when blooming in late spring.

Regional...

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

,
Greenwich, Connecticut
Chicago, Illinois
Downers Grove, Illinois
East Brookfield, Massachusetts
Lowell, Massachusetts
Saint Paul, Minnesota
Buffalo, New York
Rochester, New York (2 reports)
Wallkill, New York
Drexel Hill, Pennsylvania
Mountain Top, Pennsylvania
Seattle, Washington
Stanwood, Washington



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