+16,000 (4 grams) Stevia seeds | Fresh by Stevia-Store Original Stevia Seeds (non-GMO). Collected twice per month. All stevia seeds live for 90 days. You need to find black seeds (seeds that are alive) in order to make them germinate.. You need at least 2 grams (8000 seeds) for germination. It's a tropical herb. Stevia-Store owns plantations in South America with original Stevia plants.