Distinctive Foliage
Produces spiny green leaves with attractive white marbled markings.
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Medicinal Milk Thistle is a flowering herb known for its spiny green leaves with distinctive white markings and purple flower heads. It is traditionally grown as an herbal plant and is valued for its seeds, which contain silymarin compounds. Milk Thistle can be grown in herb gardens and suitable outdoor planting areas.
Produces spiny green leaves with attractive white marbled markings.
Develops large purple flower heads that add ornamental interest to herb gardens.
Its mature seeds contain silymarin, a group of naturally occurring plant compounds.
Grows in sunny locations with well-drained soil and moderate watering.
| Scientific Name | Silybum marianum |
| Common Name | Milk Thistle; Blessed Milk Thistle; Marian Thistle |
| Plant Family | Asteraceae |
| Seed Type | Herb Seeds |
| Growth Habit | Upright, branching herbaceous plant |
| Flower Color | Purple to reddish-purple |
| Foliage | Spiny green leaves with white markings |
| USDA Hardiness Zones | 5–9 |
| Planting Season | Spring or fall, depending on climate |
| Seed Starting | Direct sow approximately 1/4 inch deep |
| Germination Time | 7–14 days under suitable conditions |
| Germination Temperature | Approximately 60–70°F |
| Sunlight | Full sun |
| Soil Requirements | Well-drained, moderately fertile soil |
| Watering | Moderate watering; avoid waterlogged soil |
| Blooming Season | Late spring through summer |
| Mature Plant Size | Approximately 2–5 feet tall |
| Plant Spacing | Approximately 18–24 inches |
Medicinal Milk Thistle adds distinctive white-marked foliage and beautiful purple flowers to herb gardens. Its mature seeds are traditionally valued for their naturally occurring silymarin compounds. Grow this hardy herb in a sunny location with well-drained soil.