How to grow Broccoli Microgreens
Updated October 2026
Broccoli microgreens are broccoli seedlings grown densely on a tray and cut when the first leaves have opened, usually 7 to 14 days after sowing. They have a mild cabbage flavor and a satisfying crunch, and they grow indoors all year on a sunny windowsill or under a light. Microgreens are a little different from sprouts, which are eaten roots and all and carry a higher food safety risk.
📖 Our full guide: How to Grow Broccoli Microgreens
Not to be confused with: Broccoli sprouts are germinated seeds grown in a jar and eaten whole, roots included. Microgreens are grown in a potting mix or on a mat in light and cut above the roots, so they are drier and carry fewer food safety concerns.
Where to plant
Grow broccoli microgreens indoors, at normal room temperature, on a bright windowsill or under a grow light. They can also be grown outdoors in a shaded spot in mild weather, but indoor trays give the most control and are easy to keep clean.
Good air movement matters, because the plants grow so densely. A small fan nearby helps prevent mold and damping off.
Choosing a variety
Buy seed sold for sprouting or microgreens, which is untreated, or certified organic seed. Never use seed treated with fungicide, which is meant only for planting in the garden. Buying in larger packs is far cheaper than small garden packets.
How to plant
- Fill a clean, shallow tray with an inch or two of moist seed starting mix, or lay a damp growing mat in it, and level the surface.
- Scatter broccoli seed thickly and evenly over the surface and press it gently into the mix.
- Mist the surface, then cover the tray with another tray or a lid for two to three days to keep in warmth and humidity while the seeds sprout.
- Once the seedlings lift the cover, uncover the tray and move it into bright light. Vent any cover so moisture does not build up.
- Water lightly from below or mist the surface so it stays moist without wetting the leaves heavily.
Watering and feeding
Keep the growing medium evenly moist but never waterlogged. Watering from below, by setting the tray in a shallow dish of water for a few minutes, keeps the leaves dry and reduces mold.
Microgreens need no fertilizer; the seed holds all the food the seedling needs for this short time.
Harvesting
Cut the stems just above the soil line with clean scissors once the first seed leaves have fully opened, or when the first true leaves begin to show, usually 7 to 14 days after sowing. Broccoli microgreens do not regrow after cutting, so sow a new tray every week for a steady supply.
Rinse the greens, pat them dry and use them soon, in salads, sandwiches, wraps and on top of soups. They keep a few days in a closed container in the fridge.
Pests and diseases
With good hygiene and air flow, the main problem is damping off.
Broccoli Microgreens is rarely troubled by pests.
Diseases to watch for
- Damping off Seedlings collapsing in patches at the base, often with fine white fungal growth, in wet, warm, still air. Use clean trays, fresh mix, less water and a fan.
Common questions
What is the difference between broccoli sprouts and microgreens?
Sprouts are germinated seeds grown in water and eaten whole, roots and all. Microgreens are grown in a medium in light for 7 to 14 days and cut above the roots. Because they grow in drier conditions and the roots are left behind, extension services note microgreens carry fewer food safety concerns than sprouts.
How long do broccoli microgreens take?
About 7 to 14 days from sowing, once the seed leaves have fully opened.
Do broccoli microgreens regrow after cutting?
No. Broccoli microgreens are cut once and do not regrow, so compost the old roots and sow a fresh tray.
Why is there white fuzz on my microgreens?
Fine white root hairs near the base are normal and look fuzzy. Cobweb-like growth spreading over the soil, with collapsing seedlings and a musty smell, is mold or damping off. Use less water, water from below, uncover the tray once seeds sprout and add a fan.
Can I use regular garden broccoli seed?
Only if it is untreated. Many garden seeds are coated with fungicide for planting outdoors and must not be eaten. Buy seed sold for sprouting or microgreens.
Do microgreens need a grow light?
A bright, sunny windowsill works, but a grow light gives sturdier, greener seedlings, especially in winter.
Sources we checked: University of Maryland Extension: Growing Microgreens and Baby Greens Indoors; University of Minnesota Extension: Mini greens, mega benefits, growing microgreens at home; UF/IFAS Extension Broward County: How to Grow Microgreens at Home; Colorado State University Extension: Growing Microgreens.
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