1/2 teaspoon is 1/4 strength. full strength is 2 teaspoons a gallon.
Applied:Personally, I use 1 tablespoon per gallon 2x per month. I find it to be very mild. My experience only.
If I use it at half or quarter strength, would it burn any Drosera, Utricularia or Pinguicula that happen to get caught in the overspray?