Seed Treatment:
• Cold stratification is recommended: Place seeds in a moist paper towel or sand in a sealed bag and refrigerate at 35–40°F (1–4°C) for 2–4 weeks.
• Optional: Soak seeds in warm water for 12–24 hours before stratification to help soften the seed coat.
When to Sow:
• Indoors: Start seeds 6–8 weeks before the last frost after stratification.
• Outdoors: Direct sow in fall for natural stratification or in early spring after last frost.
Sowing Instructions:
• Sow seeds ¼ inch (6 mm) deep in moist, well-draining soil.
• Ideal soil temperature for germination: 65–75°F (18–24°C).
• Germination takes 14–30 days.
Light Requirements:
• Prefers full sun for best flowering and strong stems.
• Can tolerate very light shade.
Soil Requirements:
• Grows best in well-draining, average to poor soil.
• Tolerates dry, sandy, or rocky soils.
• pH range: 6.0–7.5.
Watering:
• Water regularly during germination and establishment.
• Once established, Globe Thistle is drought-tolerant and only needs occasional watering.
Spacing:
• Thin or transplant seedlings to 18–24 inches (45–60 cm) apart.
Growing Tips:
• Produces unique spiky blue globe-shaped flowers in mid to late summer.
• Attracts bees, butterflies, and pollinators.
• Excellent for cut flowers and dried arrangements.
• Deer- and rabbit-resistant.
• Hardy perennial in USDA Zones 3–9.