Echinacea purpurea, commonly known as purple coneflower, is a hardy herbaceous perennial native to the central and eastern United States. This striking wildflower features distinctive daisy-like blooms with purple-pink petals surrounding a cone-shaped central disk, and has been traditionally used by Native Americans for medicinal purposes. Seeds have relatively high germination rates (80-90% without treatment, up to 98% with cold stratification) and are best started indoors 8-10 weeks before the last frost or direct sown in fall for natural stratification.
Before sowing
Cold stratification is optional but recommended for higher germination rates and faster germination. Without stratification, germination rate is 80-90%; with 4 weeks stratification, rates reach 98%.
Sowing
What to expect
Tips
Sow seeds 1/8 inch deep and lightly tamp soil; keep substrate moist but not waterlogged. Cold stratification for 4 weeks at 4°C (40°F) in moist sand or paper towel significantly improves germination speed and uniformity. Can be spring or fall sown without stratification, though germination may be slower. Remove seeds from cold stratification 48 hours after treatment begins; they typically germinate within 7-20 days at 65-75°F. Prevent damping-off by ensuring good airflow and avoiding excessive moisture. Once seedlings appear, provide bright light for 16+ hours daily.
Sources: Johnny's Selected Seeds, Savvy Gardening, GrowIt BuildIT, Eden Brothers, Siskiyou Seeds, Mother Earth News, NC State Extension, Missouri Botanical Garden, peer-reviewed research (Wartidiningsih et al., Bratcher et al.)
