? Seed Treatment
Cold Stratification Required:
• Mix seeds with moist sand or peat
• Seal in a plastic bag and refrigerate for 4–6 weeks at 35–40 °F (1–4 °C)
• Check weekly: ? If seedlings sprout in the fridge, remove them gently and plant immediately.
• Check periodically to keep medium moist (not wet or moldy)
? Best Time to Sow
• Outdoors: Late fall (natural stratification) or early spring after cold treatment
• Indoors: Start 6–8 weeks before last frost after stratifying
? Soil
• Well-draining, loamy or sandy soil
• pH 6.0–7.5 (neutral to slightly acidic)
☀️ Light
• Full sun to partial shade
?️ Optimum Temperature
• 15–20 °C (59–68 °F) for best germination
? How to Sow
• Surface sow – press seeds into soil, do not cover (light needed)
• Mist soil gently to avoid displacing seeds
? Watering
• Keep soil evenly moist during germination
• Avoid soggy conditions
⏳ Germination Time
• Typically in 3–6 weeks after stratification under ideal conditions
? Spacing
• Thin or transplant seedlings 6–12 in (15–30 cm) apart
? Growing Tips
• Forms graceful clumps – ideal for borders, wildflower areas & rock gardens
• Low-maintenance and drought-tolerant once mature
• Attracts pollinators with star-shaped blue-purple blooms