Tyrol knapweed (Centaurea nigrescens)

Tyrol knapweed

Also known as: Doubtful knapweed

Centaurea nigrescens is a summer-flowering plant, commonly known as tyrol knapweed. It is native to central and southeastern Europe. It was also introduced to some parts of the United States but is now regarded as a noxious weed there. The plant is a unique star thistle.

Scientific classification

Species

Tyrol knapweed (Centaurea nigrescens)

Asters bellflowers fanflowers and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer, Fall

Bloom Time

Purple

Flower Color

Semi-evergreen

Leaf type

0 - 38 ℃

Ideal Temperature

Images of Tyrol knapweed

Distribution of Tyrol knapweed

Distribution Map

Tyrol knapweed predominantly thrives in the temperate regions of Europe, where it is native. Over time, it has been introduced and has naturalized in parts of North America and Central Europe, furthering its range. This spread illustrates the adaptability of tyrol knapweed to diverse environments beyond its original habitat.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Roadsides, fields, waste areas

Care Guide for Tyrol knapweed

Every week

Water

Full sun

Sunlight

0 - 38 ℃

Ideal Temperature

Water: Originating from alpine meadows, tyrol knapweed prefers moderate moisture and can tolerate brief dry periods. Water weekly to ensure balanced hydration. Thriving outdoors, tyrol knapweed benefits from natural rainfall and requires well-draining soil to replicate its native environment.

Fertilize: For optimal growth, tyrol knapweed thrives on balanced nutrition. Apply a 10-10-10 NPK fertilizer bi-annually in spring and fall, using one tablespoon per square foot. Water thoroughly after fertilizing. Adjust feeding frequency based on the growth stage to prevent over-fertilization and promote healthy blooms.

Pruning: Tyrol knapweed has lance-shaped leaves and pinkish-purple flowers. Prune from early to late spring by removing dead stems and thinning crowded areas to boost air circulation. This promotes growth, blooms, and reduces invasiveness. Sterilize tools to lower infection risks.

Propagation: Tyrol knapweed, from the Asteraceae family, is best propagated through cuttings for genetic consistency. Use healthy, non-flowering stems with several nodes, apply rooting hormone, and place in well-draining substrate. Maintain consistent moisture, good aeration, and high humidity to promote root development.

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