Sprouting guide · jar method
How to grow broccoli sprouts
Jon Emery, RN
Trained in the Soil Food Web method · germination-tests every lot sold here
Updated Jul 2026
6 sources
Soak two tablespoons of sprouting-grade broccoli seed overnight, then rinse and drain twice a day in a mesh-lidded jar. Sprouts are ready to eat on day five. No soil, no light requirement until day four.
Quick facts
- Seed per jar
- 2 tbsp (~20 g)
- Soak time
- 8–12 h, cool water
- Rinse schedule
- 2× daily, morning + evening
- Harvest day
- Day 5 (green cotyledons)
- Yield
- ~120 g per jar
- Storage
- 7 days, refrigerated dry
Soak
Add two tablespoons of seed to a wide-mouth quart jar, cover with a few inches of cool water, and fit the mesh lid. Soak 8–12 hours — overnight is right. The seed roughly doubles in size.
Drain and park
Pour off the soak water through the mesh, rinse once, and drain thoroughly. Prop the jar at a 45° angle, mouth down, in a bowl or stand — out of direct sun. Airflow matters more than light.
Rinse twice a day
Morning and evening: fill with cool water, swirl, drain fully, and re-park. This is the entire maintenance. Skipped rinses, not bad seed, cause most failures.
Green up
On day four, move the jar into indirect light. The yellow cotyledons turn green within a day. Fuzzy white root hairs are normal — they are not mold (see FAQ).
Harvest and store
Day five: rinse a final time, drain well, and spin or pat dry. Dryness is what buys you a week in the fridge. Expect about 120 grams per jar.
Questions we actually get
Is the white fuzz mold?
Almost always no. Root hairs are bright white, appear only near the roots, and vanish when rinsed. Mold is grey-blue, webbed across the mass, and smells off. When in doubt, rinse — root hairs disappear, mold doesn't.
Why sprouting-grade seed and not garden seed?
Sprouting-grade lots are grown, cleaned, and pathogen-tested for the purpose of being eaten raw as seed-dense food. Garden packets aren't held to that standard and may be treated. Ours never are — every lot page shows the test.
Do I need a sprouting kit?
No. A quart jar and a mesh lid are sufficient. The kit exists because the stand and stainless lid make the twice-daily rinse faster, not because the method needs hardware.
How much should I eat?
Most research on broccoli sprouts uses servings in the range of 30–100 g fresh weight per day (Fahey et al., 1997; Yagishita et al., 2019). We cite the literature; we don't make medical claims.