Bull cotton thistle (Onopordum tauricum)

Bull cotton thistle

Also known as: Taurean thistle

Bull cotton thistle is considered a noxious weed in many US regions. It is hard to miss this plant's big purple flowerheads, sporting the characteristic thistle appearance. Although similar to its close relative O. Illyricum, bull cotton thistle's leaves are green and smooth, not hairy.

Scientific classification

Species

Bull cotton thistle (Onopordum tauricum)

Asters bellflowers fanflowers and allies

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Early summer, Mid summer

Harvest Time

2 m

Plant Height

7 cm

Flower Size

Purple

Flower Color

Semi-evergreen

Leaf type

20 - 35 ℃

Ideal Temperature

Distribution of Bull cotton thistle

Distribution Map

Bull cotton thistle is a plant primarily native to parts of Eastern Europe and the Mediterranean region. Over time, it has been introduced to other areas of the world, specifically in some parts of the Eastern Hemisphere. Although it is not native outside its primary range, bull cotton thistle now grows in these introduced regions where it has been able to adapt to local conditions.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Pastures, Roadsides, Wastelands

Care Guide for Bull cotton thistle

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Native to Mediterranean regions, bull cotton thistle thrives in dry climates and low humidity. It requires weekly watering, reflecting its drought-tolerant nature. Often grown outdoors, bull cotton thistle is well-suited for xeriscaping in arid areas, showcasing resilience and adaptability to sporadic moisture.

Fertilize: For bull cotton thistle, apply balanced nutrition fertilizers during the growing season and high-nitrogen fertilizers pre-flowering for better blooms. Fertilize monthly, following guidelines to prevent damage. Adjust frequency in dormancy and ensure proper dilution; water post-application to enhance nutrient absorption and maintain bull cotton thistle's health and beauty.

Pruning: Bull cotton thistle features spiny leaves and purple flowers, benefiting from annual pruning. Key practices include removing dead stems and cutting back old growth in early to late spring to promote new growth. Effective pruning enhances airflow, reduces disease risk, and improves appearance.

Propagation: Bull cotton thistle reproduces through sowing in well-draining soil, avoiding waterlogging. Direct sowing is recommended due to sensitivity to transplanting. Scarifying seeds aids germination, requiring a light soil cover for light exposure. Consistent gentle watering is essential until seedlings are established.

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