Originally Posted by TommyTaps
Im making a 2 gallon batch of pumpkin ale and my recipe only requires half a pack of Wyeast 1272. My question is can i save the other half for a near future brew? I am considering making a starter, and putting it in the fridge inside of a paper bag to keep the light, but im not sure if my yeast will stay alive long this way. Normally i would just throw the other half away, but at $7 a pack each + shipping i would like to use. Any thoughts are greatly appreciated...brew on!!!!
I'd almost be willing to bet that a proper pitch rate is NOT half the package, and probably the entire package would be better anyway.
There is a great resource on mrmalty.com that is a yeast pitching calculator.
For example, in a 2 gallon batch with an OG of 1.060 and yeast that is 1 month old, the proper amount to pitch is 1.1 vials!
If your projected OG for a 2 gallon batch is 1.050 or higher, one vial would be the correct amount to pitch in most cases.