Reuse Eggshells to Start Seeds
This is about as green as you can get.
Take half an eggshell - rinsed out of course - poke a hole in the bottom with a pencil or needle or something about that size. then, fill it with potting soil, and lay your seed. When the seedling is looking like it’s ready to put in the ground - this is the cool part - squeeze the eggshell just enough to generate a small crack. Then put the seedling, shell and all, into the soil. the roots grow right throug the cracks, and the shell decomposes adding rich nutrients to the soil.
And there you have it.
