I planted my tomatoes with eggshells to discourage the “blossom-end rot” or whatever it’s called, and that seems to be working.
However, I’ve got some yellow summer squash that seems to have a similar problem; I’m adding a calcium supplement that seems to be helping somewhat.
For future reference, would I be doing any harm if I just planted everything with extra eggshells or other calcium?
No harm done, and if some of those shells are not pulverized and left in larger pieces
consider it a 'time-release capsule' of calcium supplement.
I put eggshells into every area of soil - sometimes a couple months before planting. I thought, “Why not?”
Using egg shells regularly is an great thing to do. I make it a point to save some of the shells separate from the other compost.
After they dry, I put them in one of my old blender containers and grind them to a fine powder, when I’m lazy, I just smash them by hand. Sometimes I add in bone meal and Epsom salts. Makes a fine additive for the tomatoes.
So far, I’ve never had blossom end rot. Some people put a tum anti-acid tablet in the pot for a quick boost. IIRC, Diana rinses milk jugs and waters the tomato plants with that.
I have some old instant milk that I forgot about and it’s way past expiration, so I’m thinking about using it next year.