Originally Posted by DannPM
They shouldn't be selling people yeast that old.
Um...It hasn't expired yet, how is it wrong?
Besides, If you make a starter, then the age of a yeast isn't really an issue. When you make a starter, and grow it, you're replicating more yeast to make up for any loss. You're making new, fresh yeast.
To me that means it doesn't really matter the age of the yeast, because you'll be pitching FRESHER yeast, yeast you grew yourself.
Bobby M did a test on year old stored yeast here; http://www.homebrewtalk.com/f13/testing-limits-yeast-viability-126707/
And my LHBS cells outdated tubes and packs of yeast dirt cheap 2-3 dollars each
and I usually grab a couple tubes of belgian or other interesting yeast when I am there and shove it in my fridge. and I have never had a problem with one of those tubes.
I usually make a starter but I once pitched a year old tube of Belgian High Gravity yeast directly into a 2.5 gallon batch of a Belgian Dark Strong, and after about 4 days it took off beautifully.
The purpose of a starter is to reproduce any viable cells in a batch of yeast....that;s how we can grow a starter form the dregs in a bottle of beer incrementally...and that beer may be months old.
Even if you have a few still living cells, you can grow them....That's how we can harvest a huge starter (incrementally) from the dregs in a bottle of some commercial beers. You take those few living cells and grow them into more.
Yeast are cannibals, those that survive will eat those that are dead. You won't notice them.
I've used over a year old jar of yeast with no issues.
I think new brewers stress the date of their yeast packs way too much. You forget that in making starters, you are GROWING YEAST.
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