Your First Microgreens Harvest

Use clean trays, correct moisture, useful light, and crop-specific timing for a safe, crisp first cut.

What you are actually growing

Microgreens are ordinary vegetable seedlings harvested at the first true-leaf stage. Because you never grow them to maturity, container depth, root room, and season stop mattering. That is exactly why they are the most reliable first crop for someone with a dim flat and no outdoor space.

Setting up the tray

Use a shallow tray 4 to 6 cm deep with drainage, filled with clean fresh mix rather than reused material. Sow far more densely than you would for a mature crop — the seedlings support each other. Larger seeds such as peas and sunflowers benefit from soaking for several hours first.

Germination, then light

Cover the tray for the first three to four days to keep humidity up while seeds germinate. Then uncover and give them light. Microgreens are a low-light crop and a bright window without direct sun is enough, but a dark corner is not: too little light produces pale stretched stems that are edible but weak.

Watering without drowning them

This is where first attempts usually go wrong. Water from below where you can, keep airflow moving, and never let the tray stand in water. Fungus gnats or a slimy surface mean the mix is staying too wet. The dry-out-a-bit advice used for potted plants does not apply here — a shallow tray can go from damp to dead within hours.

Harvesting

Cut with clean scissors just above the mix once the first true leaves appear, usually seven to fourteen days for brassicas and ten to eighteen for pea and sunflower shoots. Sunflower shoots often carry their seed hulls up with them; pick those off. Most microgreens do not regrow after cutting, so start a new tray rather than waiting.

Keeping a supply going

Sow a small tray every week or so instead of one large one. You get a steady supply rather than a glut, and if a tray fails you have lost very little. Wash trays between sowings, because clean equipment prevents most of the problems people attribute to bad seed.