IYF08 Sour Batch - Imperial Organic Yeast

IYF08 Sour Batch - Imperial Organic Yeast

In Stock
Delivers to ( change ) by as part of our Fast & Free Shipping.
Faster Shipping Available. Details.
60 day no hassle return policy. Details

F08 Sour Batch is a combination of two Brettanomyces strains, Lactobacillus, and a low attenuating Belgian saison yeast. The blend is ideal for lambics, farmhouse ales, Flanders reds and any other beer you wanna get funky with.

  • Temp: 68-76°F, 20-24°C
  • Flocculation: Low
  • Attenuation: 80-95%
  • Alcohol Tolerance: 12%
  • Cell Count: 200 Billion

White Labs Equivalent: N/A
Wyeast Equivalent: N/A

Usage Instructions:

  • ​Store refrigerated until ready to pitch
  • Shake and kneed pouch to homogenize slurry
  • Sanitize the sealed pouch
  • Open and pitch entire contents into well-aerated wort

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 # IYF08
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.37 LBS
Community Q&A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 1 answer
Why did you choose this?
MoreFlavor Store
Good had before
Pete M on Feb 27, 2023
Recommend with Flanders Red kit
Ryan M on Apr 2, 2020
Good had before
Pete M on Feb 27, 2023
For peach sour
Norm E on May 4, 2020
Recommend with Flanders Red kit
Ryan M on Apr 2, 2020
Experimenting with home brewing sours
Quinn H on Mar 25, 2020
Last Flanders did very well souring with it.
Brian S on Oct 24, 2019
Imperial Organic is the best and this seemed like a good fit for a berlinerweisse.
Michael E on Oct 21, 2019
Never used before. Worth trying
Greg P on Jul 20, 2019
F08 did a great job with my last Flanders Red and earned me a few medals.
Brian S on Jul 15, 2019
Because White Labs WLP665 isn't currently available.
Valued C on Jan 12, 2019
For peach sour
Norm E on May 4, 2020
Experimenting with home brewing sours
Quinn H on Mar 25, 2020
Would I add the whole package to a one gallon batch?
Wayne Liddy on Jan 13, 2019
BEST ANSWER: Hi Wayne - You could use half of the package for 1 gallon but also refer to this calculator - http://www.mrmalty.com/calc/calc.html

4.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 1 out of 5
Won't use it again
Pitched 2 packages into 10 gallons of well oxygenated 1.064 wort. No blow off activity even with temp into high 70's. s.g. hovering about 1.022 after 3 weeks. I hope it will drop further with more time. Taste is VERY tart, with a lot of underlying sweetness. Might make a good BBQ sauce, but not something I want to drink if it doesn't attenuate further.
April 16, 2020
over 2 years ago
Response from MoreFlavor
Sorry to hear about your bad experience with this yeast blend. It is interesting that you've gotten tartness developed while still having so much residual sugar. A couple ways to salvage the batch would be to either add an additional pitch of brettanomyces and a healthy dose of patience or perhaps a powdered amylase enzyme to reduce the starches to sugars that the microbes can metabolise.

We really appreciate the honesty and value great feedback like this as it helps us improve our products and those of our partnered suppliers. Cheers!
May 24, 2020
Malcolm Lieban
Rated 5 out of 5
Nice aroma!
I can just drink this yeast. When I opened this pack, it smelled like a 3 year old aged geuze.
It’s still working on my beer so I can’t tell how good it is as of now. But I believe this might work out pretty good.
December 18, 2018
over 4 years ago
Rated 5 out of 5
Makes a tasty beer
Purchased on a win and it made a tasty beer
December 9, 2018
over 4 years ago
Rated 5 out of 5
Wilds made Easy
Definitely recommended for those wanting to do wild beers without the uncertainty. My experience is this blend will make it start out young being mildly sour and mature into a horse blanket funky beer over the course of 4 months using a light wheat recipe. Flavor is good without being sharp or overwhelming.
September 25, 2018