OK that explains why some folks say put crushed egg shells on top of the dirt in a layer.
Yep. I throw crushed eggshells in the planting hole, too. Geraniums and roses also love calcium. Makes them BLOOM like crazy.
You will also see MUCH better production out of your veggie plants with added calcium. My Grandma used to pour milk at the base of her tomato plants. Same principle. :)