one thing i can say, is if youre talkin about "mixed nutes" id agree with zandor... just divide your gallon formula by 4 and use quarts to feed instead of mixing gallons....... but if you have to... just keep your mixed nutes out of the light...

store only in te dark, once i mixed some nutes in a 20oz. bottle and left it in the room under the lights and it started to grow a floating mold in it.....

yuck
ronjohn420 Reviewed by ronjohn420 on . Shelf life for nute mixes? Since I only have a handful of plants and feed my plants every two weeks or so, I won't be going through a gallon of the nute mix very quickly. When should I throw out the old stuff and make a new batch? Once a month? Once every three months? Every 6 months? I happen to use fox farm products and they are used for soil applications. Rating: 5