I'm pretty sure that a sprout can see the light when it is 1/4 or 1/2 inch below the soil. That little bit of soil is not solid, and light does penetrate the surface. Also, when I close my eyes I can still tell a difference between light and dark. I'm fairly certain that plants don't have eyeballs, but just to be safe I try to get a little light over them at least within 2 days of planting. Helps keep em warm too. I imagine you would not really need to do so until you see the first sign of life.
Opie Yutts Reviewed by Opie Yutts on . lights on seeds I guess I always thought it didn't matter, but did it anyway in case., but I just read that it doesnt matter? Do any of you throw a light on after sowing your seeds? If it's done just for heat then that doesn't matter im just curious about the light part of it. Rating: 5