Lettuce Seeds Need Light to Germinate

Plants that evolved to have their seeds exposed to the soil surface after dropping are adapted to germinating in the presence of light. Lettuce seeds, for example, need to be exposed to red light or they won’t sprout.

Sprinkle lettuce seeds on the surface of the soil and lightly press them down, but don’t cover them with soil. Check the seed packet for information about germination light (or dark) requirements before starting your trays.

Gardening Under Lights Book