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Carduus defloratus

Carduus defloratus · Asteraceae

The gardener's calendar

The right move for September

Ideal time to plant carduus defloratus: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Family
Asteraceae
Type
Perennial herbaceous plant
Flowering
June to August
Adult size
30 to 80 cm in height
Foliage
Deciduous, spiny and grey-green
Hardiness
Very hardy (-15 to -20 °C)
Origin
Mountain ranges of central and southern Europe
Soil
Well-drained, calcareous, poor to moderate

Care

Sunlight

Carduus defloratus thrives in full sun, which is essential for good flowering. It tolerates partial shade but flowers less abundantly. Look for an exposed and airy location, ideal in mountain gardens or dry areas.

Soil Preparation

This species prefers well-drained, calcareous or neutral soils, poor to moderately fertile. Avoid overly rich or waterlogged soils. Adding sand and gravel improves drainage if necessary.

Watering

Carduus defloratus is very tolerant of drought once established. Water moderately at planting time and during prolonged dry spells. This plant requires little water under natural conditions.

Fertilizer

No fertilizer is necessary. This hardy plant makes do with the elements present in average soil. Excessive fertilization promotes too much vegetation at the expense of flowering.

Pruning and Cleanup

Remove faded flower heads in late summer to encourage longer flowering and improve aesthetics. Cut the foliage to ground level in late autumn or early spring to make way for new growth.

Diseases and Pests

Carduus defloratus is very resistant to diseases thanks to its spiny foliage and natural vigor. No major problems are reported under appropriate conditions. Simply avoid stagnant moisture which could encourage root rot.

Did you know?

Carduus defloratus, known as mountain thistle, is a characteristic inhabitant of alpine and subalpine meadows, particularly in the calcareous Alps. Its specific name 'defloratus' literally means 'deflowered', referring to the particular morphology of its flowers which appear to have lost their outer sepals, giving the flower head a unique and recognizable appearance among European thistles.

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.