Cirsium rivulare
Cirsium rivulare · Asteraceae
The gardener's calendar
Ideal time to plant cirsium rivulare: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Asteraceae
- Plant type
- Herbaceous perennial
- Flowering
- June to August
- Flower color
- Pink to purple-red
- Mature size
- 60 to 100 cm tall
- Foliage
- Deciduous
- Hardiness
- Very hardy, down to -20 °C
- Origin
- Europe, humid and mountainous zones
Care
Exposure
Stream thistle thrives in full sun or partial shade. A sunny exposure optimizes flowering and plant vigor. It tolerates humid and shaded areas well near watercourses or low-lying garden spots.
Soil and terrain
This plant loves humid, even waterlogged soils rich in organic matter. It thrives along stream banks or in marshy areas. Good winter drainage remains necessary to prevent root rot from prolonged water stagnation.
Watering
Keep the soil constantly moist during growth, especially in summer. During dry periods, water regularly to prevent complete drying out. In winter, reduce watering; the plant appreciates natural humidity from cool, fresh soils.
Fertilizer
Undemanding, the plant benefits from compost or organic matter applied in spring. A balanced fertilizer applied at the start of the growing season is sufficient; avoid excess nitrogen which would promote foliage at the expense of flowering.
Pruning and maintenance
Remove faded flowers to extend flowering. In late autumn or early winter, cut the plant back to ground level. Regular cleaning of diseased or damaged foliage limits health problems.
Diseases and pests
Stream thistle is generally robust. Watch for powdery mildew in humid, poorly ventilated conditions. Slugs and snails can damage young shoots in spring. Good air circulation and well-drained soil prevent most problems.
Watering
Keep the soil constantly moist during growth, especially in summer. During dry periods, water regularly to prevent complete drying out. In winter, reduce watering; the plant appreciates natural humidity from cool, fresh soils.
Did you know?
Stream thistle is an emblematic species of mountainous humid zones in Europe. Once used in traditional medicine for its supposed purifying virtues, it remains today a valuable plant for ecological restoration of humid habitats and pollination, attracting bees and butterflies in abundance during its generous summer flowering.
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.