QuestionsHow to growVegetable GrowingPotatoesPotatoes – when do I spray 0 Vote Up Vote Down Ray Dunford asked 15 years ago I am growing potatoes for the first time (2nd earlies) and they appear to be going well. When do I need to spray them (assuming I do) and what do you recommend? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Potatoes my need ot be sprayed for blight, but earlies might get away without it. If there are blight warnings from Met Eireann, spray with a blight spray such as Dithane or Bordeaux mixture.