I would like to get some opinions on an idea I have. I want to convert one of my planters I built into a small greenhouse that I can have my seedlings in while growing. I have a heated cord used for keeping ice build up off the roof edge of the house. It is low wattage, so shouldn't use much power. I would bury that cord in the dirt in the planter and then have this lid on it. It should gradually heat up the soil and the whole planter. I may even be able to start some plants early in that soil. I could make the lid sloped for water run off. What do you all think of this idea?