Hey PC, looking great. I can give you some help on the egg shells because I make my own eggshell powder for use in my homemade organic dog food. I wash the egg shells in hot water(have read some people boil them) then I bake them to both dry them & kill any nasty stuff like bacteria. I bake them at 325 for about 7minutes then flip them & turn oven off & let them sit in oven while it cools down. They will stink if you over bake them.I have also read some people nuke gem to kill the nasty stuff. After they are dried, I put them in a coffee grinder to make powder. I would think since you are using them with plants just crushing them will suffice, when using it in dog food you to make it powder because crushed even really small it can have sharp edges & cut up a dog inside whereas in plants that isn't a concern. Not sure about plants but as a food supplement, it doesn't take much, however, I did a google search for egg shell powder in gardening & there was a 11 minute video on YouTube popped up in which they were proclaiming to tell you everything you need to know on esp for garden use. I didn't watch it cause ofthe late hour but it might be helpful. Keep up the great work & bummed about the Tigers