I recycled my egg shells because they have so many vitamins such as protein and calcium that can help seeds grow faster than growing in a Jiffy pallet (Home Depot). Isn't it awesome... it's free and less garbage for you to throw...Definitely start recycling you egg shells.
I noticed that it grow faster putting in an egg shells versus planting on a cotton.
My tip is not to over water it because there is no hole to escape water. You a sprayer to put water. It just need to be moist.
You can add egg shells into your garbage composed to do your homemade fertilizer for your garden at home...sweet stuff right??