A classic saison strain sourced from the Wallonia region of Belgium. This strain makes a classic saison by producing flavors and aromas noted as earthy, peppery and spicy. With attenuation averaging around 70 to 75%, some malt flavor will remain present. For best fermentation results, let this strain free-rise to allow for complete attenuation and production of the subtle, traditional aroma characteristics. With high gravity saisons, it’s suggested to dry the beer with an alternate yeast (such as WLP001 California Ale Yeast®) added after 50 to 60% fermentation.
**This strain has been genetically typed in our lab using polymerase chain reaction (PCR). Through this genetic testing, we have determined WLP565 Belgian Saison I Yeast to contain the STA1 gene (glucoamylase), a potential indicator of Saccharomyces cerevisiae var. diastaticus. Brewers yeast are natural hybrids, which make it possible for certain strains to display elements of the STA1 gene. These strains have the ability to utilize some dextrins (unfermentable sugars), resulting in higher levels of attenuation than what is considered typical.
At White Labs, we do everything possible to detect for undesired organisms within our process and cultures. The strains we carry with known Saccharomyces cerevisiae var. diastaticus genetics have been researched and validated to perform without excessive over-attenuating, which is possible through our nearly 25 years of experience paired with internal and external fermentation data.**
To read more about Saccharomyces cerevisiae var. diastaticus, click here.
Note to brewers: This strain tends to stall out in fermentation and then restart as long as two weeks later. Make sure the wort is well-oxygenated and allow the temperature to free rise in order to ensure complete fermentation. Some brewers add WLP001 to finish.