Cirsium acaulon
Cirsium acaulon · Asteraceae
The gardener's calendar
Ideal time to plant cirsium acaulon: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Stemless thistle
- Family
- Asteraceae
- Plant type
- Perennial herbaceous
- Flowering
- June to September
- Adult height
- 10–30 cm
- Foliage
- Deciduous, rosette form
- Hardiness
- Very hardy (down to –20 °C)
- Origin
- Central and southern Europe
Care
Sunlight
Choose a sunny to partially shaded location. This plant enjoys well-lit areas but tolerates moderate light. Avoid dense shade, which slows down flowering.
Soil and drainage
The stemless thistle thrives in calcareous, well-drained soils, even poor ones. It accepts dry and rocky terrain, typical of natural meadows. A moderate compost addition is sufficient; excessive fertilizer promotes foliage at the expense of flowers.
Watering
Once established, this plant is very water-efficient. Water regularly during the first year and during active growth periods. In summer, occasional watering is enough; it tolerates drought well.
Fertilizer
No fertilizer is necessary. This plant from naturally poor habitats prefers nutrient-poor soil. An annual application of well-decomposed compost in spring is more than sufficient.
Pruning and maintenance
Remove spent flowers to encourage new blooms and control seed dispersal. In late autumn or early spring, cut the clump back to ground level. No specific pruning is needed during the growing season.
Pests and diseases
This hardy plant is not very susceptible to diseases. Powdery mildew may appear in cases of excessive humidity and poor air circulation. Avoid overhead watering and ensure good air flow around the plant.
Did you know?
The stemless thistle is a remnant of Europe's calcareous meadows, having disappeared from many regions due to agricultural intensification. Formerly used in traditional medicine for its supposed digestive properties, it remains an emblematic plant of lean alpine and subalpine meadows, valuable for local biodiversity.
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.
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Tips generated and checked by Viridia — adapt them to your local climate.