A little tip for growing tomatoes: crush or grind eggshells and spread them at the base of your tomato plants. They will love the calcium released from the eggshells over time.
Don’t have time to crush eggshells and sprinkle them on your garden every time you use eggs? Save them up in a bowl in your fridge for a week or two and then run them through a grinder or crush them by hand before spreading them around the base of your plants.
Another tip: before you put your tomato seedlings in the ground, “plant” a whole egg in the bottom of the hole before you put your tomato plant in. As the egg breaks down, it will release nutrients into the soil.
Source: Little Farm in the BIg City blog