I need two eggs to crack one, and I save all eggshells as

fertilizers. As a matter of fact, I keep almost all kitchen wastes, veggie, fruit skins, etc. , and ferment them for a month or so before watering the plants (of course it needs to be diluted). As a result, I rarely buy any fertilizer from Home Depot. 

I have the habit of making a virtue of necessity too.:))