You can use Eggshells as seed-starter pots. Eggshells are biodegradable and they quickly biodegrade when introduced into the soil. For creating a seed starter pot, make a small hole through a raw egg and remove all the contents from inside. Clean the inside of the eggshell and create a small drainage hole at the bottom. Now, fill the eggshells with moist potting soil and add seeds into the soil. Once your seedlings grow to a point where eggshells can’t handle them, you should gently transplant the plants into a bigger pot with the shells.