Key Takeaways
- Microgreens are young vegetable seedlings harvested after about 7 to 21 days.
- You only need a shallow tray, growing medium, seeds and a bright spot.
- Radish, sunflower, pea and broccoli are beginner favorites.
- Good airflow, clean equipment and not overwatering prevent mold.
Microgreens are vegetable or herb seedlings harvested just after their first leaves open, usually 7 to 21 days after sowing, and they can be grown on a windowsill with a shallow tray and a growing medium.
Best Seeds for Beginners
| Seed | Harvest time | Notes |
|---|---|---|
| Radish | About 6 to 10 days | Fast and spicy |
| Broccoli | About 8 to 12 days | Mild, reliable |
| Sunflower | About 8 to 12 days | Soak first; crunchy |
| Pea | About 10 to 14 days | Soak first; sweet |
| Basil | About 14 to 21 days | Slower germination |
Always buy seeds sold for sprouting or microgreens from a reputable supplier.
What You Need
- A shallow tray with drainage and a second tray without holes underneath
- Growing medium such as potting mix, coconir or a hemp mat
- Microgreen seeds
- A spray bottle
- A bright window or grow light
Step by Step
- Fill the tray with about an inch of moist growing medium and level it.
- Scatter seeds evenly and densely, then press them gently into the surface.
- Larger seeds like pea and sunflower benefit from soaking for several hours first.
- Cover with another tray or a lid for the first few days to encourage germination, checking daily.
- Uncover when seeds have sprouted and move to bright light.
- Water from the bottom or mist lightly so seedlings are not disturbed.
- Harvest by cutting just above the medium once the first leaves have opened.
Avoiding Mold
- Do not over-water; the surface should be damp, not soaked.
- Provide gentle airflow.
- Use clean trays and fresh medium every time.
- Do not sow too thickly.
Storing Microgreens
Harvest, dry gently, and store in the refrigerator in a container lined with a paper towel. They are best eaten within about a week.
Sources
Figures and advice in this guide were checked against these university extension and government publications. Last reviewed November 5, 2026.
- Growing Microgreens, Penn State Extension
- Microgreens: A New Specialty Crop, UF/IFAS Extension, University of Florida
- The Amazing Power of Microgreens, UConn Extension
Frequently Asked Questions
How long does it take to grow microgreens?
Most microgreens are ready in about one to three weeks, depending on the seed. Radish and sunflower are quick, while beets and basil take longer. Harvest once the first leaves are fully open. Check the seed packet for exact timings.
Can you grow microgreens without soil?
No. You can grow them on soil, coco coir or hemp mats. Soil adds some nutrients, while mats stay cleaner and are easier to harvest. Water from below or mist lightly to avoid mould. Seed choice decides how clean the harvest looks.
Is the white fuzz on my microgreens mold or roots?
Fine white fuzz close to the stems is often root hairs, which are normal. Mould looks cottony and sits on the surface. Improve airflow, avoid overwatering and sow slightly thinner to prevent it. Good airflow is your best defence either way.
Can you regrow microgreens after harvesting?
Usually not well. Most varieties are cut once above the roots and do not regrow strongly. Compost the used mat and start a fresh tray for a steady supply of tender shoots. Fresh sowing is quicker than waiting for regrowth.
Related Guides
Featured image: Lufa Farms Microgreens in Trays.jpg by Lufa Farms, CC BY-SA 2.0, via Wikimedia Commons.
