Miracle-Gro Tomato Food should be applied every 7-14 days during the growing season.
Miracle-Gro Tomato Food can be to other veggies as well. Be sure to follow the directions on label.
The manufacturer of Miracle-Gro Tomato Food states that it is safe for use on all plants.
Miracle-Gro Tomato Food does not contain calcium. Blossom end rot is caused by a lack of calcium.
Per the Miracle-Gro Tomato Food label you can treat every 7 - 14 days. It really depends on the health of your soil and plants if you need to apply it once a week or once every two weeks, the choice is yours.