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Old 06-12-2012, 01:23 PM   #1
icarus13
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Default Harvested yeast from La Fin du Monde

I'm making an extract clone of La Fin du Monde. Since wyeast 3864 isn't available now, I decided to try to harvest the yeast from a bottle. I started with a 150 ml wort and the dregs of 1 bottle. I didn't think it worked, but finally got some pretty good activity after 6 says. I then transfered the dregs of that to a 750 mL wort and it took off immediately. After 2 days, activity has subsided (that's where I'm at now). My intent is to decant the liquid and pitch the yeast into my 5 gal wort tonight.

My concern is that if i have enough viable yeast for this beer. I spent close to $70 on ingredients and don't want to ruin it. One thing I'm considering is pitching the yeast and letting it go, but if for whatever reason the fermentation gets stuck, I have a vial of wlp530 on hand to make a yeast starter.

Any suggestions? Am I worrying too much. FWIW the beer tasted really good from the 150ml starter. OG should be around 1.09. Any advice would be greatly appreciated.

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Old 06-12-2012, 01:55 PM   #2
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I've often considered this, as I'm a huge fan of LFDM (as well as Trois Pistoles), but I've held off as I am concerned about the yeast health in a beer as big as LFDM. Additionally, I'm not sure that there will have been enough growth; dregs from one bottle into a 150ml step and then just one more 750ml step feels like it's going to leave you drastically underpitching, especially with a 1.090 beer -- you're going to need over 300 billion cells to properly pitch for that batch, according to yeastcalc. I would strongly consider a third step up to at least 2L (maybe even 3) and letting that finish out before decanting and pitching; it should get you a lot closer to that 300b cell mark.

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Old 06-12-2012, 02:02 PM   #3
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I'd also suggest making a much bigger starter.

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Old 06-12-2012, 02:03 PM   #4
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FYI wyeast 3864 is the unibroue strain

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Old 06-12-2012, 03:10 PM   #5
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Quote:
Originally Posted by icarus13 View Post
I'm making an extract clone of La Fin du Monde. Since wyeast 3864 isn't available now, I decided to try to harvest the yeast from a bottle. I started with a 150 ml wort and the dregs of 1 bottle. I didn't think it worked, but finally got some pretty good activity after 6 says. I then transfered the dregs of that to a 750 mL wort and it took off immediately. After 2 days, activity has subsided (that's where I'm at now). My intent is to decant the liquid and pitch the yeast into my 5 gal wort tonight.

My concern is that if i have enough viable yeast for this beer. I spent close to $70 on ingredients and don't want to ruin it. One thing I'm considering is pitching the yeast and letting it go, but if for whatever reason the fermentation gets stuck, I have a vial of wlp530 on hand to make a yeast starter.

Any suggestions? Am I worrying too much. FWIW the beer tasted really good from the 150ml starter. OG should be around 1.09. Any advice would be greatly appreciated.
I'd keep stepping it up until you have the appropriate sized starter for that brew.
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Old 06-12-2012, 04:56 PM   #6
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about to bottle a belgian table beer that i used the dregs of two bottles (trois pistoles and fin du monde)
like yourself, at first i thought it was a lost cause, but then that stuff started GOING TO TOWN!
even got good attenuation, so stick to it!

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Old 06-12-2012, 05:14 PM   #7
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Thanks for the advise everyone. Looks like I'll make a 2.5L starter. I figured that is what I needed to do, but I was hoping to have this beer kegged by July 14. Looks like I might miss my deadline.

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Old 06-12-2012, 06:06 PM   #8
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Quote:
Originally Posted by icarus13
Thanks for the advise everyone. Looks like I'll make a 2.5L starter. I figured that is what I needed to do, but I was hoping to have this beer kegged by July 14. Looks like I might miss my deadline.
It's best to let it age for a little while anyway. It will be good after a couple weeks but give it a couple months and hot damn!
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Old 06-12-2012, 06:14 PM   #9
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Originally Posted by icarus13 View Post
Thanks for the advise everyone. Looks like I'll make a 2.5L starter. I figured that is what I needed to do, but I was hoping to have this beer kegged by July 14. Looks like I might miss my deadline.
I see no reason why you can't meet that deadline. Do the starter now. Brew tomorrow. Ferment for 2 weeks and put it in a keg. About a week to carb and it will be ready to drink.
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Old 06-12-2012, 07:52 PM   #10
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It's best to let it age for a little while anyway. It will be good after a couple weeks but give it a couple months and hot damn!
I would like to keg it in 4 weeks, but will only need a gallon by then. Will it still continue to age well in the keg as if it were still bulk aging in the secondary? Or, perhaps I should rack 1 gallon in 4 weeks and then let the remaining 4 gal age 1-2 more months?
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