How to Start Marjoram From Seed
Sweet marjoram is a tender, slow-starting herb that benefits from being started indoors in most of the United States. Its tiny seed needs warmth, light, and gentle watering to establish well.
Start indoors or direct sow?
Start indoors and transplant after frost, particularly in regions with short summers. Direct sowing can work in warm climates, but seedlings are small and easier to manage indoors.
When to start Marjoram seeds
Sow indoors about 6 to 8 weeks before the average last spring frost. Direct sow only after frost danger has passed and the soil is warm.
How to sow the seeds
Press seed onto the surface of a sterile, fine-textured seed-starting mix and cover only very lightly, if at all. Use small cells or shallow pots, mist carefully, and keep the tray in bright light.
Germination
Germination often takes 7 to 21 days. Keep the mix evenly moist and warm, around 65 to 75 F, without allowing a crust to form on the surface.
Seedling care
Provide strong light for 14 to 16 hours a day and avoid overwatering, especially while seedlings are small. Thin to one plant per cell after true leaves form, use clean containers, and maintain airflow to discourage damping off.
Transplanting & hardening off
Harden seedlings off over 7 to 10 days, then transplant after all frost risk has passed. Choose full sun and well-drained soil, setting plants at the same depth they grew in their containers.
Tips
Do not bury the very fine seed deeply, because light helps improve germination. Pinch young plants lightly after establishment to encourage branching.
General seed-starting guidance for US home gardens; timing depends on your local frost dates and variety. Page updated Aug 4, 2026.