Mangrove Jacks M21 Belgian Wit Yeast 10g

M21 produces the citrusy, spicy, softly hazy character of Belgian witbier. It pairs naturally with the traditional wit additions of coriander and dried orange peel, complementing rather than competing with them. Very low flocculation is a characteristic of the strain — the beer is meant to stay hazy.

Best Suited To

• Belgian Witbier (Bière Blanche)
• American Wheat Beer with character
• Light Belgian ales

Specs

• Fermentation temp: 17–23°C
• Attenuation: 70–75%
• Flocculation: Very Low (permanent haze — expected)
• Alcohol tolerance: Up to 12% ABV
• Pitching rate: 1 sachet per 23L at standard gravity

When to Choose M21

Choose M21 over M20 Bavarian Wheat when your recipe is witbier rather than hefeweizen. M20 leads with banana and clove; M21 is more citrus-forward and spicy. The styles are related but the yeast character is distinct — use the correct yeast for the style.

Practical Notes

Do not fine or filter a witbier made with M21. The permanent haze is the yeast in suspension — it carries the citrus and spice flavour. Fining removes the character you brewed for.

Swirl the bottle before pouring to resuspend the yeast sediment — this is the traditional way to serve witbier.

Ferment at 18–20°C for a balanced citrus-spice profile. Warmer fermentation pushes more ester expression.

Keep refrigerated. Once opened, reseal and use within 7 days.

Reviewed by the AHB Brewing Team — June 2026.