How do I water, light, and care for microgreens?

A gentle breeze from a small oscillating fan pointed near (not directly at) your trays dramatically reduces mold and fungal issues while strengthening stems. Good airflow is the single most effective mold prevention strategy.

Most microgreen varieties thrive at room temperature between 18-24°C (65-75°F). Temperature affects germination speed, growth rate, and mold risk more than almost any other factor.

After sowing seeds, cover the tray with another tray (inverted) and place a 1-2 kg weight on top. This creates darkness and gentle pressure that forces seeds to push through the medium, building strong root systems and thick stems before they ever see light.

Microgreens need 12-16 hours of light per day after the blackout period ends (usually day 3-5). A standard full-spectrum LED shop light or grow light positioned 15-30 cm above the trays provides plenty of intensity for compact, colorful growth.

Fill the bottom tray (no holes) with about 1 cm of water and let the growing tray wick moisture up through the drainage holes. Bottom watering encourages roots to grow downward, produces sturdier stems, and keeps the leaf surface dry — reducing mold risk.