How to Grow Beet Microgreens

Beet microgreens grow indoors year-round, so there is no season to wait for and no USDA zone to worry about. Aim for a comfortable room temperature of about 65 to 75 degrees Fahrenheit and set the tray on a bright windowsill or under a grow light once the seeds have sprouted. Because beet is slower to mature, about two to three weeks, and does not regrow after cutting, stagger a few trays on rotation, starting a fresh one every week or so, for a steady supply of those deep magenta microgreens.

Beet is best grown as tray microgreens rather than jar sprouts, and soaking is recommended. Beet seed is a hard, multigerm cluster, so an 8 to 12 hour soak in cool water before sowing softens the seed coat and gives faster, more even germination.

Tray method: Use a shallow tray no more than about 2 inches deep and fill it with an inch or two of moistened fine seed-starting mix or coconut coir. Scatter the soaked seed evenly across the surface with minimal overlap, then mist lightly. Cover the tray or set it under a blackout dome for about 3 to 5 days to hold moisture and encourage even sprouting, keeping the surface moist but not soggy. A weighted blackout cover helps the seedlings shed their seed hulls as they push up. Once the seeds have sprouted, uncover the tray and move it into bright light.

A note on seed clusters: beet seed comes in clusters and the hulls can stick to the leaves. Mist and gently rub them off as the greens grow, or use that weighted blackout cover during germination to reduce the problem.

After germination, switch to bottom-watering: add water to the tray beneath rather than over the top so the foliage stays dry, which is the single best defense against mold. Give the greens 10 to 16 hours of bright light a day and keep the air moving with good ventilation. Keep the medium consistently moist but never soggy, hold the room around 65 to 75 degrees Fahrenheit, and keep your trays and tools clean. Beet is slow and steady indoors, so clean, airy, evenly moist conditions and a little patience are almost all it needs.

Beet microgreens are ready in about 10 to 20 days, once the cotyledon leaves have fully opened (the first true leaves may just be showing) and the greens stand about 2 to 3 inches tall. Harvest by cutting the stems just above the soil line with clean, sharp scissors. Let them dry a little, then store them dry in an airtight container in the refrigerator and wash only right before use. Microgreens do not regrow after cutting, so start a fresh tray for your next crop.

Beet microgreens have an earthy, mildly sweet flavor and truly stunning deep magenta and red stems, so they are as much a garnish as an ingredient. Scatter them over salads, grain and Buddha bowls, avocado toast, and soups, or use them to add a pop of color to plated dishes and sandwiches. Beyond looks and flavor, they are prized for nutrition: microgreens are remarkably nutrient-dense, often more concentrated in vitamins and antioxidants than the mature vegetable.

• Mold vs. root hairs: fine white fuzz hugging the stem near the seed that vanishes when misted is normal root hair. Slimy or cobweb-like growth spreading across the soil with a sour smell is mold. Fix mold with more airflow, less water, and thinner sowing.
• Damping off: seedlings collapse at the base from fungus in soggy, stagnant conditions. Bottom-water, improve ventilation, and avoid overwatering.
• Leggy, pale greens: too little light. Move the tray to a brighter windowsill or under a grow light and give 10 to 16 hours a day.
• Uneven or patchy germination: common with beet's hard cluster seed. Soak 8 to 12 hours first, spread the seed evenly, and keep the surface consistently damp during blackout.
• Seed hulls stuck on the leaves: beet clusters cling to the greens. Mist and gently rub them off, or use a weighted blackout cover during germination so the greens shed their hulls as they push up.