perennial

Blue Cornflower

Centaurea montana 'Blue'

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Blue Cornflower (Centaurea montana 'Blue') at Sargent's Gardens

Blue Cornflower in bloom

Blue Cornflower in bloom

(Photo courtesy of NetPS Plant Finder)

Blue Cornflower (Centaurea montana 'Blue') at Sargent's Gardens

Blue Cornflower flowers

Blue Cornflower flowers

(Photo courtesy of NetPS Plant Finder)

Height:  24 inches

Spread:  3 feet

Sunlight:  full sun 

Hardiness Zone:  3a

Other Names:  Mountain Bluet, Perennial Bachelor's Button

Description:

Deep green foliage makes a striking contrast with the curiously fringed violet-blue flowers; avoid wet winter soil; adaptable to most sites and stunning when massed; loved by butterflies

Ornamental Features

Blue Cornflower features unusual blue lacecap flowers with violet centers at the ends of the stems from early summer to mid fall. The flowers are excellent for cutting. Its attractive narrow leaves remain green in color throughout the season. The fruit is not ornamentally significant.

Landscape Attributes

Blue Cornflower is an herbaceous perennial with an upright spreading habit of growth. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This plant will require occasional maintenance and upkeep, and is best cleaned up in early spring before it resumes active growth for the season. It is a good choice for attracting butterflies to your yard. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;

  • Disease

Blue Cornflower is recommended for the following landscape applications;

  • Mass Planting
  • Border Edging
  • General Garden Use
  • Container Planting

Planting & Growing

Blue Cornflower will grow to be about 24 inches tall at maturity, with a spread of 3 feet. It grows at a fast rate, and under ideal conditions can be expected to live for approximately 15 years.

This plant should only be grown in full sunlight. It is very adaptable to both dry and moist locations, and should do just fine under typical garden conditions. It is considered to be drought-tolerant, and thus makes an ideal choice for a low-water garden or xeriscape application. It is not particular as to soil pH, but grows best in poor soils. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selected variety of a species not originally from North America. It can be propagated by division; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

Blue Cornflower is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. With its upright habit of growth, it is best suited for use as a 'thriller' in the 'spiller-thriller-filler' container combination; plant it near the center of the pot, surrounded by smaller plants and those that spill over the edges. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden. Be aware that in our climate, most plants cannot be expected to survive the winter if left in containers outdoors, and this plant is no exception. Contact our store for more information on how to protect it over the winter months.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Massing  Edging  Garden  Container 
Applications
Flowers  Foliage Color  Attracts Wildlife 
Ornamental Features