Centaurea Species, Basket Flower, Giant Knapweed, Globe Centaurea, Lemon Fluff Knapweed

Centaureamacrocephala

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Centaurea (sen-TAR-ee-uh)
Species
macrocephala (mak-roh-SEF-uh-luh)
Synonym
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
Spacing
18-24 in. (45-60 cm)
Hardiness
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)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
Parts of plant are poisonous if ingested
Plant has spines or sharp edges; use extreme caution when handling
Pollen may cause allergic reaction
Bloom Color
Bright Yellow
Bloom Time
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
May be a noxious weed or invasive
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
From seed; sow indoors before last frost
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Juneau, Alaska

Kiowa, Colorado

Parker, Colorado

Hayden, Idaho

Chicago, Illinois

Greenville, Indiana

Barbourville, Kentucky

Livermore Falls, Maine

Mason, Michigan

Pinconning, Michigan

Hackensack, Minnesota

Minneapolis, Minnesota

Rosemount, Minnesota

Saint Cloud, Minnesota

Mathiston, Mississippi

Munsonville, New Hampshire

Hilton, New York

Ithaca, New York

Syracuse, New York

Wallkill, New York

Brinkhaven, Ohio

Columbus, Ohio

Patriot, Ohio

Westerville, Ohio

Albion, Pennsylvania

Norristown, Pennsylvania

Wilkes Barre, Pennsylvania

Kalama, Washington

Olympia, Washington

Spokane, Washington

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Gardener's Notes:

4
positives
2
neutrals
1
negative
Sort By:
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C
Livermore Falls, ME | July 2017 | positive

I purchased seeds for this from Johnny's Selected Seeds about ten years ago after seeing it in a friend's garden. It has thrived in my Zo...Read More

P
P
| August 2013 | negative

This species has been classified as a prohibited noxious weed by the Alberta Government
Please check your province/state

K
columbia, TN (Zone 7a) | August 2010 | positive

have had this for years, love the flower head,It's even self sowed a few times.

L
Ithaca, NY (Zone 5b) | March 2005 | positive

I grow these flowers for use in dried arrangements. The "basket weave" pods look wonderful, with or without the flower still showing in ...Read More

L
| August 2004 | positive

My plant is in it's second year and now has over a dozen flowers. the leaves are not particularly attractive but it's well worth it for ...Read More

W
Seward, AK (Zone 3b) | August 2002 | neutral

I was attracted to this plant when I saw it in a seed catalog under the name 'Armenian Basket Flower', probably due to the unusual patter...Read More

P
Westbrook, ME (Zone 5a) | November 2001 | neutral

This bold perennial adds an informal touch to the garden. The foliage is course, and strong stems support the large 3-4 inch flowers. The...Read More

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