Red star-thistle (Centaurea calcitrapa)

Red star-thistle

Also known as: Common star thistle, Purple knapweed, Red star thistle, Caltrap

Centaurea calcitrapa is a thistle rarely found in its native habitat of Europe, yet outside its native range, this thistle is considered a problematic environmental weed. It grows in fields, along roadsides, and in disturbed areas, creating dense thickets. Red star-thistle is unpalatable, and the crowded populations of this spiny thistle degrade the forage quality in American fields.

Scientific classification

Species

Red star-thistle (Centaurea calcitrapa)

Asters bellflowers fanflowers and allies

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Biennial, Perennial, Annual

Lifespan

Herb

Plant Type

1.5 cm to 2 cm

Flower Size

Purple, Pink, Lavender

Flower Color

Semi-evergreen

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Red star-thistle

Distribution of Red star-thistle

Distribution Map

Red star-thistle is native to the Mediterranean region and parts of Western Asia. It has been introduced to various other places, expanding its presence to continents such as Asia, Europe, and South America. The plant has adapted to these regions and is now part of the flora beyond its original range.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Waysides, waste places

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Red star-thistle

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Red star-thistle originates from arid regions and exhibits strong drought tolerance, thriving with minimal water. It prefers weekly watering and is ideal for xeriscaping or rock gardens. Typically suited for outdoor cultivation, red star-thistle's water needs significantly impact its growth cycles and seasonal vigor.

Fertilize: Fertilize red star-thistle with balanced nutrition fertilizers (10-10-10) during active growth in spring and early summer. Use high-nitrogen options if foliage is poor. Apply quarterly, adjusting doses for young vs. mature plants. Avoid over-fertilization, especially during dormancy.

Pruning: Pruning red star-thistle in early to late spring enhances its health. Focus on shaping, removing dead wood, and promoting airflow. This method improves appearance, reduces pests, and encourages blooming, while controlling spread for stronger growth.

Propagation: To propagate red star-thistle, collect and clean seeds from dried flower heads, then store them in a cool, dry place. Use well-draining soil and full sun exposure. Sow seeds shallowly, keeping the soil moist but not soggy until seedlings establish.

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Images of Red star-thistle

Distribution of Red star-thistle

Care Guide for Red star-thistle

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