Microgreens

Understanding the terminology matters in the kitchen and at the market. Sprouts are germinated seeds harvested within 2–7 days before any leaves emerge—grown entirely in water with no growing medium. They carry higher food safety concerns due to the warm, humid conditions required, and are often implicated in recalls. Microgreens require soil or another medium and develop stems and cotyledon leaves, giving them more substance and a shorter shelf life. Baby greens occupy the middle ground: harvested after true leaves develop, typically around 30 days or more, with more substantial leaves and a more developed character. The USDA does not have formal legal definitions distinguishing these categories, which can lead to confusion on product labeling. When purchasing, read carefully—'sprouts' and 'microgreens' are not interchangeable terms.

Microgreens grown in soil or composted material carry inherent food safety considerations that are especially relevant for at-risk populations. Pathogens such as Salmonella and E. coli can be present in growing media if not produced under controlled, food-safe conditions. Commercially grown microgreens from reputable suppliers follow stricter protocols than homegrown batches using garden soil. For this reason, microgreens are not recommended for immunocompromised individuals, pregnant women, or young children unless sourced from certified food-safe producers. When growing at home, use sterile growing media, maintain clean equipment, and refrigerate immediately after harvest. Sunflower microgreens require particular attention—if they develop an ammonia or sour smell, discard them immediately, as this indicates bacterial decay rather than normal aging.

Growing microgreens at home is straightforward and yields fresher product than most commercial offerings. A standard 10×20-inch tray (common in commercial production) works well, but any shallow container with drainage holes suffices. Fill with 1–2 inches of moist growing medium—sterile potting mix, coconut coir, or hydroponic mats work well. Sow seeds densely but not overlapping; larger seeds like sunflower and pea benefit from a 4–12 hour pre-soak to improve germination rates. Mist the surface, cover with a humidity dome or another tray, and keep in darkness for 2–3 days until germination begins. Once seeds sprout, remove the cover and move to light. Bottom-watering (setting the tray in a shallow water bath) prevents damping off and mold; misting is only appropriate during the initial germination phase. Most varieties grow at room temperature (60–75°F) under a sunny window or grow lights for 12–16 hours daily. Rotate trays weekly for even growth. Harvest with sharp scissors just above the soil line, wash only before use, and store unwashed in a breathable container.