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Cover the tray with plastic wrap. Fill the flat tray with 1⁄2 inch (13 mm) of distilled water. Store the tray in a warm area. Move the tray to a sunlit area once seedlings sprout and uncover them.
Plastic wrap will help keep the moisture in the tray for longer and create a humid environment that promotes germination. Leave small openings on the sides of the tray so air can still circulate to your seeds. You can also purchase a humidity dome from a gardening store for the same effect. If the dome has an air vent, keep it open for air flow. The cells will soak up water from the tray so you do not have to water your seeds from the top. Check the levels of the water in the tray daily.  Fill the tray back to 1⁄2 inch (13 mm) of water when levels are below 1⁄8 inch (3.2 mm) deep. If you overfill the tray, the roots of your seedling may become waterlogged and develop rot. Sunlight is not essential for seeds to grow, but it will not hurt them either. Keep the tray in the warmest area of your home. The soil temperature should stay above 65 °F (18 °C) for most plants to successfully germinate. Soil temperature can be measured with a soil thermometer placed at the same depth as the seeds. Once you see sprouts in your cells, move your tray to a windowsill or an area with about 6 hours of indirect sunlight. Remove the plastic wrap or humidity cover so your seedlings can get full exposure to the light.  Turn your tray 180° every other day so your seedlings do not grow crooked. You can also keep seedlings under grow lamps so the plants will grow evenly.