[smiddy]

hi all. i've heard that epsom salts are good for tomatoes,
     is this right, and how much and how often. I'd apprieciate
      any advice. thanks.

[JayG]

An important ingredient, but not a 'magic' one which will double your crop (if only!)
Most tomato feeds contain magnesium, which should be enough if applied at the recommended dose.

[smiddy]

     Thanks for that jayg.