How to make Bordeaux Mixture
Could you please advise precisely the ingredients and quantities required to make half a gallon of Bordeaux Mixture. There is a method on this site but I do not understand the quantity'31/3' tablespoons of copper sulphate! Thanks very much. Mary McCarthy
Certified GKH Gardening Expert
3 1/3 tablespoons comes out to just about 50 ml of copper sulphate. That's for a gallon recipe, however. So if you want only half a gallon, you would want to use 35 ml of copper sulphate and 5 tablespoons or about 75 ml of hydrated lime.