Radish microgreens are one of the fastest hydroponic crops, producing spicy cotyledons and tender stems in shallow trays or mats within about a week when grown.
Identification
Growth habit: Fast-growing brassica microgreen harvested at the cotyledon to early true-leaf stage.
Cotyledons: Young seed leaves are heart-shaped to rounded, crisp, and usually green to purple depending on cultivar.
Flavor: Distinct peppery, spicy radish flavor.
Edible Parts
Cotyledons and tender stems: Harvest with clean scissors above the media line when cotyledons are open.
Propagation
Seed: Sow untreated food-grade radish seed densely on a clean hydroponic mat, paper, mesh, or shallow media surface.
Seed: Keep covered and humid for the first 2–4 days, then expose to light for greening.
Cultivation
Microgreen tray culture: Best method; use shallow trays with clean mats or thin media, dense sowing, good drainage, and airflow.
Hydroponic mat culture: Works well on hemp, jute, cellulose, coco mats, or similar food-safe microgreen media.
Bottom watering: Preferred after germination to reduce leaf wetness and disease pressure.
Lookalikes
Broccoli microgreens: Similar brassica microgreen form, but usually milder.
Mustard microgreens: Also spicy and fast-growing, but with sharper mustard heat.