Tomatoes need calcium; too little calcium in the soil can lead to blossom-end rot on fruit. To help prevent blossom-end rot you can side dress your tomatoes early in their growing process, after they have been planted in the ground and have established themselves. We used bone meal, an organic solution, to provide calcium for our tomatoes.

We placed a few tablespoons around the base of the plants (peppers shown here).

Then we turned the bone meal gently into the soil with a trowel.

We then watered as usual.