Milk Thistle Seeds (Organic)

Milk thistle (Silybum marianum) is a striking annual or overwintering annual herb, native to the Mediterranean and now widely naturalized across parts of North America. Recognized for its glossy, white-variegated leaves and bold purple flowers, this robust plant produces the flavorful milk thistle seed—prized for both traditional use and culinary use. Our organic milk thistle seeds grow strong, upright plants in full sun and well-drained soil, offering an excellent option for gardeners and herbalists alike. Each packet contains approximately 50 certified organic seeds.

Variety Details

• Botanical name: Silybum marianum
• Plant type: Hardy Annual
• Growth habit: Low Growing
• Crop category: Vegetable
• Kitchen profile: Milk thistle (Silybum marianum) is a striking annual or overwintering annual herb, native to the Mediterranean and now widely naturalized across parts of North America.
• Recorded feature: Open-Pollinated
• Product format: Seed packet

Sowing & Growing

• Light: Full Sun
• Planting season: Spring
• Starting location: Direct Sow
• Recorded soil pH: 6.6 - 7.0 or 7.1 - 7.5 or 7.6 - 8.0

Use the product-specific sowing figures for Milk Thistle as the starting point, then adjust timing to local soil temperature and frost conditions. Prepare the bed before planting, preserve the recorded spacing, and evaluate moisture at root depth instead of following a universal calendar. Watch development as the stated maturity window approaches and harvest at the size, texture, or color preferred for the crop. Label the row with the sowing date so actual performance can inform future plantings.

Before sowing Milk Thistle, review the packet alongside the current product details and note any range in temperature, germination, or maturity. Ranges reflect biological and seasonal variation rather than a fixed promise. Label each planting with its date and location, then compare emergence, growth, and harvest with local weather. This record is useful for succession plantings and for deciding whether the crop fits better into an earlier or later seasonal window.

Explore related options in our Herb Seeds.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.