Seeds don’t exactly “expire,” but their ability to sprout gradually declines over time. With the right storage, your microgreen seeds will stay viable for years, giving you strong germination and healthy trays every time.
Key Storage Tips
- ✅ Cool, Dry & Dark: Store seeds away from heat, light, and humidity for maximum lifespan.
- ✅ Airtight Containers: Use sealed jars or pouches; add a silica gel packet to guard against moisture.
- ✅ Fridge or Freezer: For long-term storage, refrigeration or freezing works well — just let seeds return to room temperature before planting.
Microgreen Seed Viability Guide
Here’s how long you can expect popular microgreen seed varieties to last under proper storage:
- 1–2 Years: Garlic Chives, Onion, Corn Salad
- 3–4 Years: Radish, Sorrel, Basil
- 4–5 Years: Beets, Broccoli, Cabbage, Mustard, Kale, Mizuna
Quick Germination Test
Not sure about older seeds? Test them first:
- Place 10 seeds (e.g., broccoli, pea, or sunflower) on a damp paper towel inside a sealed bag.
- Keep moist at room temperature.
- Check after 5–10 days to see how many sprouted — that’s your approximate germination rate.