Yeasts are micro-organisms used in brewing to produce alcohol during the process of fermentation.

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When is it necessary to pitch fresh yeast for bottle conditioning?

I've read that you can leave an ale to secondary for months and enough yeast will remain in suspension that you won't need to pitch additional yeast when bottling. But are there times when you do ...
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Harvesting commercial yeast

Which commercial beers (local and/or national) are bottle conditioned and still have viable yeast? Also, what do commercial brewers do that renders the yeast unusable (pasteurization, filtering, ...
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Using Granular Yeast in a Lager

Will dry yeast do any good when brewing a lager or is it necessary that you use a liquid one? I am talking about making some kind of starter with the yeast, not just pitching it into the fermenter. ...
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What is attentuation?

What is attentuation? How does it effect beer flavor and quality? How is is calculated and why do I need to know it?
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WLP001 v. WLP051

WhiteLabs provides these two great American Ale yeast strains (among others). WLP051 (California Ale V yeast) and WLP001 (California Ale Yeast) What are the differences in these two strains and what ...
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What would cause yeast to fail to flocculate?

I am using WLP002 - English Ale Yeast - in my current batch, a Young's double chocolate clone. According to the manufacturer's product page, this yeast is highly flocculant. The beer remained in the ...
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Fermenter Heating Belt

Is it worth using? I was thinking of getting one to use on my first fermenter for a german weissbier so that the yeast flavour and aroma is more present in the final result. By how many degrees does ...
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Yeast starter temperatures

What temp guidlines apply to doing a yeast starter? Should the starter be at the intended fermentation temp? Should it be higher for good growth/activity? Should it be lower to keep it clean ...
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Is a yeast starter required when brewing a lager?

Is using a yeast starter 100% essential when brewing a lager or can you use a few liquid vials?
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[WIKI] Fermentation Temperature Control Methods

What different methods do people use to maintain or control fermentation temps? This includes maintaining temps for both Ales and Lagers. For most climates, active control is necessary for doing ...
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Using champagne yeast

I would like to make an IPA that is very bubbly and dry like a champagne. I'm assuming to get it really bubbly I would just bottle with champagne yeast, but to achieve the dryness would I also ferment ...
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Dry yeast vs wet yeast

I've always thought it to be common knowledge that wet yeast is better than dry yeast for home-brewing. This was confirmed by Sam Calagione at his Authors at Google talk where he suggested that using ...
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Smack Pack and Pitching Time

So I completed my first batch of homebrew this morning, but I forgot one potentially (okay, not potentially, definitely) important aspect of the whole process: the yeast. I didn't forget it, per se, ...
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How to grow yeast?

I have read that it is possible to grow your own yeast, but I have not been able to find exact instructions. I would like to grow my own yeast so that I don't have to spend money on those small ...
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Is my yeast dead?

I'm in the middle of bottling my stout right now. The OG was 1.070, and the gravity almost a month ago (11/24) was 1.024. I added 3/4 cup priming sugar in about 3 cups of water, and bottled about 20 ...
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What is yeast nutrient?

I am trying to prepare alcoholic lemonade using: lemons, water, dextrose, lactose, and champagne yeast. I read that it is a good idea to add yeast nutrient but I have no idea what it is or where to ...
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How do you choose a yeast?

What characteristics do you look for in a yeast to pair with your recipe? Is there a common reference?
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Fermentation stopped but beer seems too sweet - why?

My last beer went through a normal 10-day fermentation process and afterwards there was no activity. I assumed that most of the sugars had been consumed. But after I bottled my beer and let it ...