Stevia rebaudiana is a perennial herb native to Paraguay and Brazil, valued for its leaves containing steviol glycosides that are 200-300 times sweeter than sugar. Seed germination is notoriously challenging, with naturally low viability (10-40%) requiring careful attention to temperature, light, and humidity conditions for successful propagation.
Before sowing
Cold stratification or seed priming with potassium chloride (KCl) for 32 hours improves germination rates. Select black viable seeds and discard tan seeds.
Sowing
What to expect
Tips
Use black seeds only, discarding light-colored tan seeds which are inviable. Keep soil at 70-75°F with bright light and maintain high humidity using a plastic dome or wrap. Sow seeds on surface, pressing firmly but not covering, as light aids germination. Do not allow soil to dry out or become waterlogged to prevent damping-off. Consider seed priming with potassium chloride or cold stratification to improve germination rates significantly.
Sources: Territorial Seed, Kitchen Garden Seeds, Purdue University, ScienceDirect, Park Seed, West Coast Seeds, Survival Garden Seeds
