Maybe this will help control the early blight I have been fighting this spring. And the over watering in my upside down tomatoes.Caused by all the rain we have had.11/2 to 2 inches per week. If the roots are shallow the plant will likely dry out faster (causing wilting). Watering once every 2-3 days is a good idea. By using a stick to check the depth 8-12 inches deep is about right where the water should reach.