Microgreens Growing Guides: Trays, Light and Harvest

Harvest microgreens at the first true leaves (6-14 days), cut above the mix, skip washing, and chill at 41 °F for up to two weeks.

Microgreens need a DLI of about 9–16 mol/m²/day: roughly 150–280 µmol/m²/s for 16 hours. Here is how to set hours, PPFD and lamp height.

Blackout period by crop: 1–2 days for arugula and radish, 3 days for pea and sunflower, longer for basil and cilantro, plus when to uncover and why.

Grams of seed per 10x20 tray for 18 microgreens, from Johnny's trial data and Utah State Extension, plus how to scale to any container.

How to grow microgreens without soil on hemp, jute or coir mats: trial results, seed rates, when to feed, step-by-step setup and food safety.