Milk Thistle Seeds - Silybum Marianum, 30 seeds

Quantity: 30 Seeds / pack

Milk Thistle (Silybum marianum) is a striking, fast-growing plant with large, thistle-like purple flower heads and bold leaves marbled with white veins along the midribs. It makes a dramatic architectural plant for the back of sunny borders and wildflower-style plantings.

Why choose our seeds?

• Showy purple thistle blooms on tall, statuesque stems
• Distinctive white-marbled foliage for ornamental interest
• Easy, fast-growing plant for sunny, open spots

How to grow Milk Thistle seeds

Choose Your Planting Method

• Indoors: Start indoors 4–6 weeks before the last frost.
• Outdoors: Direct-sow in spring after the last frost; this is the simplest method.

Prepare Your Materials

• Seed-starting trays or pots (if indoors)
• Well-draining potting mix
• Spray bottle for misting

Sowing the Seeds

• Sow 1/4 to 1/2 inch deep and cover with soil.
• Water in well after sowing.

Provide the Right Conditions

• Light: Full sun.
• Temperature: 55–70°F (13–21°C) for germination.
• Humidity: Keep soil lightly moist until seedlings are up.

Germination

• Seedlings usually appear in 7–14 days.
• Thin early so the strongest plants have room to develop.

Transplanting

• Set out after frost, or thin direct-sown seedlings in place.
• Space plants 24–36 inches apart; milk thistle grows large.

Care Tips

• Sun: Full sun.
• Water: Water during establishment; established plants tolerate drier spells.
• Fertilizer: Generally not needed in average garden soil.
• Wear gloves when handling — the leaves and stems are spiny.

Bloom Time:

Late spring to midsummer.