Eryngium planum (Blue Sea Holly)

Seed Treatment
Cold stratify seeds for 4–6 weeks. Wrap in a damp paper towel, seal in a plastic bag, and refrigerate.
? If seeds sprout during stratification, remove and plant immediately in moist soil.

When to Sow
Indoors: 6–8 weeks before the last frost
Outdoors: In fall or early spring for natural stratification

Sowing Instructions
• Use well-draining seed-starting mix in trays or pots
Do not cover seeds – they need light to germinate
• Mist gently to keep soil moist but not soggy

Germination Details
Time: 3–8 weeks
Temperature: 18–21°C (65–70°F)
• Be patient—germination may be slow and uneven

Post-Germination Care
• Provide bright light or grow lights
• Keep soil slightly moist with good air circulation
• Transplant to larger pots when true leaves appear

Transplanting Outdoors
• Harden off over 7–10 days
• Transplant after frost into full sun and well-drained soil
• Space 30–45 cm (12–18 in) apart

Growing Tips
• Drought-tolerant once established
• Prefers poor, sandy, or rocky soil
• Deadhead to encourage blooms or allow to self-seed
• Loved by bees and perfect for dried arrangements