Big-head knapweed (Centaurea macrocephala)

Big-head knapweed

Also known as: Large-headed star-thistle

Big-head knapweed is enjoyed for its thistle-like appearance and bright yellow flowers, which sit atop its stem. It is highly popular as an ornamental plant, has been planted in gardens for more than 200 years, and is used in dried flower displays. However, this perennial is listed as a noxious weed in parts of North America.

Scientific classification

Species

Big-head knapweed (Centaurea macrocephala)

Asters bellflowers fanflowers and allies

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Perennial, Annual, Biennial

Lifespan

50 cm

Spread

Green

Leaf Color

5 cm to 8 cm

Flower Size

Yellow

Flower Color

Green, Yellow

Stem Color

Deciduous

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Big-head knapweed

Distribution of Big-head knapweed

Distribution Map

The plant big-head knapweed is native to the mountainous regions of South Caucasus and neighboring areas in Western Asia. It has been introduced and is cultivated in various parts of Europe and Australia, where it has adapted to local climates and can be found in gardens and horticultural collections.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Meadows, grassy clearings

Care Guide for Big-head knapweed

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Originating from mountainous regions, big-head knapweed prefers moderate moisture and can handle dryness. It requires consistent weekly watering for robust growth and thrives in outdoor gardens, benefiting from natural rain patterns that enhance flowering during the growing season.

Fertilize: To promote strong growth and blooming in big-head knapweed, use balanced fertilizers with high phosphorus in spring. A lighter feed in late summer may be necessary. Apply granular, slow-release formulas carefully during active growth, and water thoroughly; reduce feeding in dormant winter months to avoid root burn.

Pruning: Big-head knapweed features large flower heads and benefits from pruning in early to late spring. Remove dead stems for airflow and to prevent disease. Light, regular trimming promotes growth, maintains shape, and enhances aesthetics, while cutting back spent flowers encourages new blooms.

Propagation: Big-head knapweed propagation involves sowing seeds in well-draining soil. Stratifying seeds enhances germination. Maintain consistent moisture while avoiding waterlogging. Once established, seedlings can be transplanted to their final locations, resulting in robust plants that add vibrancy to gardens.

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