GigaYeast GB121 Farmhouse Sour


GigaYeast GB121 Farmhouse Sour is a blend of Belgian ale yeast, Brett and lactic acid bacteria–  sweet, sour and a little funky. It imparts bright sour flavors with sweet, fruity esters, small amount of spicy phenolics and a hint of funky barnyard.

Lactic Acid Bacteria are inhibited by hops, high gravity and low temperatures. You can adjust sourness by increasing or decreasing these variables. More than 7 IBU, gravity above 1050 or temps below 65 F will increase the time to sour or lead to reduced overall souring. Warmer fermentation temps will typically increase the esters and spicy phenolics of the saison ale yeast in this blend.

Recommended Temperature Range: 68 F to 80 F

After 14 days at 71 F in 1.045 OG sweet wort, Ph 5.6

  • Apparent Attenuation: 89%
  • ABV: 4.9%
  • Final Ph: 3.1 (300X acidification)
  • 1.4% lactic acid W/V

Each GigaYeast Gold Pack has over 200 BILLION yeast cells. It's basically double the pitch for just a couple more bucks!

GigaYeast is a respected yeast company based in San Francisco, CA.

We ship our liquid yeast at the beginning of the week and include a cold pack during warm months to ensure freshness.