Fill pot with 2" of soil then place one uncracked raw egg in the pot. As it decomposes, it will serve as a natural fertilizer.
Eggshell Flowerpots Using eggshells as pots, your kids can grow a tiny garden right inside of an egg carton. Plant seeds according to package instructions, and nestle planters in an egg carton on a sunny windowsill, where they can be watered easily. When plants have grown to about 3 inches and have at least two sets of true leaves, they are ready to be transplanted to the garden.