Mary Swanson - Have you thought of putting ground limestone on in the fall? You'd be able to give up the rot stop if you had a supply of Calcium in the soil - I even get by with adding a handful of lime in the planting hole in the spring. The other contributor to blossom end rot is uneven moisture, so anything you can do to see the moisture supply is more even would help, such as mulching and watering on a very regular basis. This will also help keep the tomatoes from splitting after a heavy rain.

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