Cirsium tuberosum
Cirsium tuberosum · Asteraceae
The gardener's calendar
Ideal time to plant cirsium tuberosum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- English name
- Tuberous Thistle
- Family
- Asteraceae
- Type
- Perennial herbaceous plant
- Flowering
- July to September
- Adult size
- 60–120 cm in height
- Hardiness
- Very hardy (−15 °C and below)
- Foliage
- Deciduous
- Origin
- Central and southern Europe
Care
Light
Place your Cirsium tuberosum in full sun or light partial shade for optimal flowering. It tolerates sunny locations well and appreciates good light throughout the day.
Soil
This plant adapts to most well-drained soils, even chalky or poor ones. It prefers well-aerated soil and isn't bothered by drought once established. Avoid overly wet soils or prolonged waterlogging.
Watering
Water regularly during the first year to encourage root establishment. Afterwards, it becomes very drought-tolerant and only needs watering during prolonged dry spells or active flowering periods.
Pruning
Cut back spent flower stems in late summer to encourage more abundant flowering and prevent self-seeding. In autumn or early spring, cut dry stems down to ground level to tidy up the clump.
Fertilizing
Apply balanced fertilizer in spring or simply add well-decomposed compost to the soil surface. Cirsium tuberosum isn't very demanding and thrives in poor soils.
Diseases and pests
This species is generally robust and rarely affected by disease. In very wet conditions, root rot may occur; improve drainage in such cases. Aphids may colonize young shoots without causing major damage.
Did you know?
Cirsium tuberosum gets its "tuberous" name from its fleshy tuberous roots, which allow it to survive difficult conditions and drought. This underground adaptation makes it an excellent choice for dry gardens and poor soils, highly valued by modern ecological gardeners.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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- WormwoodArtemisia absinthium
Tips generated and checked by Viridia — adapt them to your local climate.