Imperial Yeast | A20 Citrus Ale | Beer Yeast | Double Pitch | 200 Billion Cells

Imperial Yeast | A20 Citrus Ale | Beer Yeast | Double Pitch | 200 Billion Cells

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  • A20 is a “wild” saccharomyces yeast strain known to produce a huge citrus fruit ester profile
  • Produces orange and lemon aromas along with some tropical fruit
  • Double pitch size with a minimum of 200 billion cells—twice the size of the standard yeast pitch
  • Imperial Yeast is a group of hard-working, fermentation fanatics who provide the brewing industry with the highest quality, most effective yeast possible

A20 Citrus offers up orange and lemon aromas alongside some delicious tropical fruit notes. For a high ester production use Citrus at the high temp range. Because its a wild saccharomyces strain, you will get a bit of funkyness without the uncertainty of a brettanomyces strain.

Attenuation: 73-75%
Flocculation: Low
Alcohol Tolerance: 10% ABV
Optimum Fermentation Temp: 67-80°F
Cell Count: 200 Billion
Similar Strains: WLP644

Please Note: For best results we Always recommend ordering an Ice Pack with your liquid yeast. Ice Packs can be found below in the "You might Also Need" section.

Please Note: When choosing an ice pack option beware that the liquid yeast will not arrive cold even when shipped together. Ice packs and insulated mailing options are designed to keep the yeast colder for longer during shipment, but they will not ensure that your yeast arrives cold. We will not replace liquid yeast that arrives warm. During warmer months we strongly recommend you choose dry yeast.

Item # IYA20
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.37 LBS
Community Q&A

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Why did you choose this?
MoreFlavor Store
Great yeast
Kevin P on Mar 7, 2023
Suggested by commercial brewer.
Josh J G on Nov 16, 2022
Great yeast
Kevin P on Mar 7, 2023
It makes good stuff brother
Zachary C on Feb 22, 2023
Suggested by commercial brewer.
Josh J G on Nov 16, 2022
Trying different yeast strains to see the outcome difference
Todd on Nov 2, 2021
Belgian trois yeast for tropical brett IPA
Jan DiVincenzo on Oct 19, 2021
Trying it out
Matthew S on Feb 9, 2021
Good yeast, used it before
Jamie W on Dec 4, 2020
fantastic product
Sam T on Nov 26, 2020
Sounds good to me, trying different things
Anthony C on May 19, 2020
I want to make a citrus based spirit
Robert K on May 14, 2020
trying to brew a lemon ipa
Valued C on Apr 22, 2020
It is the recommended yeast for the beer I am brewing
Michael L on Mar 31, 2020
Brewing a Tangerine Pale Ale.
Kimberly on Mar 31, 2020
Great for hazy ipa good citrus character
John D on Mar 19, 2020
Wild IPA
Tristan W on Apr 2, 2019
For a citrus compliment to my Tart Honey Boy
Trek Gabriel M on Dec 3, 2018
trying a new yeast
Robert G on Nov 17, 2018
Good product
Richard P on Sep 10, 2018
Jeffery L on Sep 10, 2018
House Yeast
Mike S on Aug 8, 2018
It is good
Chase S on May 16, 2018
Much higher cell count than WLP644
Mike V on May 4, 2018
I need to make a beer.
Rikk Desgres on May 3, 2018
great cell count and a brett like yeast without the brett
Will D on Mar 20, 2018
Interesting flavors.
Richard W on Mar 16, 2018
Used WLP version 1x with good results in tropical pale ale. Bigger pitch with IOY.
Peter W on Mar 16, 2018
Have had great results with my hoppy pale ales and ipas
Valued C on Feb 26, 2018
I have liked wlp644, but i dont want to have to grow up the very low cell count.
Kenton C on Feb 16, 2018
I want to see how fermenting close to 80F will produce fruity esters for a hoppy DIPA
Jon M on Jan 27, 2018
Hoping to make a sourish ipa
Chandler O on Jan 25, 2018
When fermented above 66 f this yeast makes a great NEIPA, or fruit forward IPA.
Dustin O on Jan 13, 2018
It makes good stuff brother
Zachary C on Feb 22, 2023
Trying different yeast strains to see the outcome difference
Todd on Nov 2, 2021

5.0 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
I was brewing a Thai pale ale with ginger lemon grass and kafir lime leaves and wanted to really get allot more citrus aroma so I used thianyeast and feremented it at about 78-80’degrees and got a whole lot of citrus aroma! Really love how it turned out and I will def order this yeast again wanna try it in NEIPA
User submitted image
Added Dec 2, 2018
December 2, 2018
over 5 years ago
Rated 5 out of 5
Joining the Hype-Wagon
If you listen to two of my favorite podcasts, you'll have heard respected hobbyists tout the merits of this brand. This is my first time with the brand, my second time with Sacch trois. The give you pitchable amounts, unlike the other guys. The yeast itself lives up to the name.
April 3, 2018
over 6 years ago
Rated 5 out of 5
Quality packaging, arrived quickly. Highly recommend purchasing the ice packs for shipping.
April 2, 2018
over 6 years ago
Rated 5 out of 5
High temp fermentation for fruity IPA.
I put this yeast through a high temp fermentation and it produced nice, fruity esters - as advertised. It has been bottled and I’m giving it a good month to see how the final product turns out. It had aromas of peaches and oranges so I look forward to the end result.
February 18, 2018
over 6 years ago
Rated 5 out of 5
Great NEIPA yeast
I have brewed 3 batches of NEIPA with this yeast and I really like the character of the finished beer. Very hazy, huge hop aroma, excellent ester profile. The esters are orange, lemon-lime, and other than that are clean. I have fermented one batch at 64f and another at 68f. I couldn't tell the difference, both were excellent. I kegged after 12 days of fermentation, with the last day ramping up a few degrees, and I would say that the beer is not as dry as the same wort fermented with Saf 05, much rounder and fuller mouth feel.
No can problems.
July 8, 2017
Rated 5 out of 5
Ripped super dry. Low turb
Tried this on a Belgian Smoked Ale with OG of 1.058. This yeast took 3 weeks at 64F to bring this to a bone ripping dry ale. This yeast contributes to late hop flavors and aromas due to its clean fermentation. I've harvested my yeast from this batch and look forward to using it in other full flavor ales.
February 19, 2017
Rated 5 out of 5
Very Happy
Put together a simple trial run recipe for this yeast using 10lbs of German Pale Malt and a half lbs of caramel 40. I chose Azacca hops to compliment the tropical characteristics in this yeast's description and it has turned out wonderful; Amarillo would also have been a good choice.

I accidentally went a little high on fermentation temps (around 83-84F) and the sourness knocked me back about 4 days into fermentation but now that it's chilled and kegged it's giving me everything I'd hoped for. I will, on purpose, ferment at the same temps again. I bet going even higher would not have any ill effects.

Attenuation was right at 81%. It still has some haze but has only had about 4 days cold crash before hitting the keg so we'll see how another week or two cold conditioning affects that aspect.

I will be trying more of the different strains of Imperial Organic Yeast!

January 17, 2017
Rated 5 out of 5
Love this yeast!
It is great in IPAs, blonds, and anything you want some nice Tartness.
Their "Dryhop" Yeast which s a blend of this and Barbarian is also good.
August 8, 2016
Rated 5 out of 5
Just as described
After reading about this yeast an alternative to WLP644 I decided to try it out in a "Brett IPA" and I could not be happier with the results! Fermentation started within a few hours and was nice and healthy. After about a month of primary fermentation the yeast had cleaned up the beer nicely and left behind all the great aroma and taste you'd expect from a yeast like this. This is now a go-to yeast for me for brewing similar beers.
April 22, 2016