I’m looking to use my yeast slurry (from a 1.047 Helles) for a 1.052 Steinbier. I was trying to use MrMalty.com, but I have a question that I can’t seem to find a definitive answer for.
When using smack packs, it’s easy to know what the “harvest date” is – it’s printed on the package. But for a yeast slurry, I’m not so sure… In this case, I have a 34/70 Helles that was brewed on 26-Jan and began lagering on 15-Feb (while still in the primary fermenter). I’m planning on brewing the Steinbier the 2nd weekend in March and was contemplating just racking the Helles into the the keg on the night before brew day so I could just transfer the appropriate amount of slurry to the new fermenter at that time.
So… What should be considered my “harvest date”? And are there any issues with using yeast slurries that have went through the lagering process?