I saw recently how a gardener is washing, drying well & crushing eggshells, then putting them in the ground around her tomato plants to add calcium to the soil. Apparently, tomatoes love calcium. I can easily do it myself (I have 8 plants), but first wanted to check with this forum. Does this make sense!

Yes. However it may be better to use liming products or calcium sulfate (gypsum) to add more calcium to your soil, based on your pH needs.

In other words, all plants need calcium for greening and plant cell development, but don't mess up your soil pH by adding too much lime to your soil if you don't need it. Gypsum is balanced with calcium and sulfur so it doesn't mess up your soil pH in native high alkalinic soils.

Calcium is also in bone meal products.

Happy Gardening!