WLP550 lag time

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Linalmeemow

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I did a patersbier yesterday, in the fermenter at 10:30am with a sachet of WLP550 liquid yeast. When I've used liquid yeast before it's gone off like a rocket but this time, almost 36 hours hours later there are no signs of life. Should I be starting to worry yet?
 
The main questions for this one are:
What was the date on the yeast, and
Did you do a starter?
 
It was in date, though only by 3 weeks or so. No starter, but it wasn't a massively high gravity wort (around 1055).
 
Started slightly cooler this time, though only by 2 degrees at 20. Last time it was off like a rocket within 6 hours!
 
Happy to report that it's started now. Not very vigorous, but a small bubble every couple of seconds at the moment. Very relieved!
 
At 5 months old you probably only had around 30% viability resulting in it taking longer to grow up to working concentration. Glad it's kicked off now, I've got a dark strong with that yeast (well the wyeast version), it looks a promising one to play about with.
 
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