Perilla frutescens, commonly known as shiso, beefsteak plant, or perilla, is an annual herb native to the Himalayan mountains and East Asia (particularly China, Korea, and Japan). Seeds require light to germinate and benefit significantly from cold stratification and soaking pretreatments. Germination typically occurs within 7-21 days under proper conditions, with seeds needing consistent moisture and temperatures between 18-28°C.
Before sowing
Cold stratification for 7-14 days (or freezer storage) followed by 24-hour water soaking provides optimal germination; short cold period of 2-3 days also effective
Sowing
What to expect
Tips
Store seeds in freezer for best germination. Soak seeds in water for 24 hours before sowing to reduce germination time to 4-7 days. Use cold stratification (7-14 days at 4°C) to break dormancy. Sow seeds on or just barely below soil surface as they require light. Maintain consistent but not waterlogged moisture. Avoid overwatering seedlings to prevent damping off. Use fresh seed each year (viability drops sharply after 1-2 years). Grow in full sun to partial shade in warm, frost-free conditions. Pinch flowering tips to encourage leaf production. Direct sow after last frost or start indoors 4-6 weeks before last frost.
Sources: Johnny's Selected Seeds, Harvest to Table, The Seed Collection, North Carolina Extension, Gardenish, PlotMyGarden, Just Hungry, West Coast Seeds, PFAF Plant Database, Twining Vine Garden, Pubmed Research, Magic Garden Seeds, Nature & Nurture Seeds
