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PlantSnap
Plant Care
Scotch thistle
(Onopordum acanthium)
Also Known As
Scotch thistle, Cotton thistle, Giant thistle
About This Plant
Onopordum acanthium is a biennial plant species that can grow up to 2 meters tall. It has a large, spiny stem with purple flowers that bloom from June to September. The plant is native to Europe and Asia and has been introduced to other parts of the world.
Plant Care Instructions
Outdoor Size Range
Up to 2 meters (6.5 feet) tall and 1 meter (3 feet) wide
Light Requirements
Full sun to partial shade. At least 6 hours of direct sunlight per day.
Humidity Needs
Does not have specific humidity requirements.
Fertilizing Schedule
Does not require fertilizer, but can benefit from a balanced fertilizer applied in early spring.
Pruning Guidelines
Prune the plant after flowering to prevent self-seeding and to promote bushier growth.
Common Pests and Diseases
The Scotch thistle is susceptible to aphids, spider mites, and powdery mildew.
Indoor Size Range
Not suitable for indoor cultivation
Watering Schedule
Low to moderate watering. The plant is drought-tolerant and can survive in dry conditions.
Temperature Range
Can tolerate a wide range of temperatures, from -10°C (14°F) to 40°C (104°F).
Growing Season
Late spring to early fall.
Growing Difficulty Level
Easy to grow, but can become invasive in some regions.
USDA Hardiness Zones
3-8
Did You Know?
The Scotch thistle is the national emblem of Scotland and is featured on the country's coat of arms.
