Echinops ritro
Ball thistle
Common names: Steel‑blue ball thistle, Bee thistle
Photo: Isidre blanc · CC BY-SA 4.0 · Source
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Description
Echinops ritro produces steel‑blue, spherical flower heads from July on upright, silvery‑hairy stems, creating a small sculptural effect in the garden. It is one of the best bee and bumblebee attractors in summer gardens and reliably draws butterflies and other wild bees. The spiny, thorn‑like leaves give the plant a hardy character, while the flowers remain easily accessible to insects. As a steppe and drought‑tolerant species, it thrives on lean, well‑drained soils and full sun, and pairs well with prairie beds, gravel gardens, and naturalistic perennial borders.
Care instructions
Plant the ball thistle in a warm, full‑sun location with well‑drained, rather lean soil; heavy, clayey earth is poorly tolerated. Water regularly only during the growing phase; afterwards it copes well with summer dryness and requires little additional watering. Fertilizer can largely be omitted; nutrient‑rich soil softens the stems and can cause the plant to fall over. Leave spent flower heads over winter—they provide seeds for birds and a winter refuge for insects. Cut back only in early spring, around week 8–10. After several years, divide the clumps in spring to maintain flowering vigor and propagate new plants.
Soil & site
Soil pH
Soil type
well-drained, lean, dry, lime-loving
Feeding
Light feeder
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