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Sour Plum Belgian

GB123


Description Blend of Trappist ale yeast and lactic acid bacteria. No wild yeast or Brett. Creates a clean tart beer with stone fruit esters and no discernible phenolics. In general, sour blends require a longer fermentation time than pure ale strains– 7-10 days at a minimum– to finish. 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 belgian ale yeast in this blend.

10 days at 71 F in 1060 sweet wort, Ph 5.6

Apparent Attenuation–77%

ABV– 6.2%

Final Ph– 3.5 (33X acidification)

1.3% lactic acid W/V


Recommended Temperature Range† 68 F to 80 F
Tasting Notes Sour with fruity esters.

Representative Styles Saison, Sour Beer, Lambic


* Attenuation was measured after 8 days with Ale yeast at 70˚F and Lager yeast at 50˚F. Medium Gravity is 14˚ – 16˚Plato. High Gravity is 23˚- 25˚Plato.

† The working temperature range represents the range at which fermentation for a given strain produces a typical attenuation- not necessarily the ideal temperature for your particular beer style. As a rule of thumb, start ale yeast fermentation at 68˚ – 72˚F and then lower or raise temp as desired. Lager Yeast are typically fermented at 45˚ – 58˚F. If desired, Lager Yeast can be given a “hot start” at 65-68˚F and then lowered to the primary temperature after active fermentation begins (10-20hrs).

GigaYeast laboratory is still gathering data on many of our strains. Information provided here may change some in the future. Please call if you need more info.