Silybum marianum
Milk thistle
Photo: C T Johansson · CC BY 3.0 · Source
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Description
The milk thistle, botanically *Silybum marianum*, is immediately recognizable by its glossy green, white‑marbled foliage and the bold violet thistle flowers that appear from July onward. Originally from the Mediterranean, it thrives in sunny, dry sites and has been used for centuries as a traditional liver tonic. The sharply serrated leaves bear fine spines, so it is best handled with gloves. The plant is non‑poisonous to children and pets, though the spines can sting, so it is advisable to place it a bit away from play areas.
Care instructions
Choose a full‑sun, warm spot with well‑drained, somewhat sandy soil; the milk thistle does poorly in damp conditions. Sow directly in the garden from mid‑April to May. It develops a deep taproot early on and is difficult to transplant later. Water sparingly once the seedlings have established; the plant tolerates extended dry periods. Keep the bed weed‑free during the first few weeks; thereafter the spiny foliage will suppress competition. Harvest the flower heads as soon as they open, using sturdy gloves to protect against the spines.
Soil & site
Soil pH
Soil type
well-drained, lean, lime-loving, dry
Feeding
Light feeder
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