Mangrove Jacks M54 California Lager Yeast 10g

M54 is the practical lager yeast — designed to produce clean, lager-like character at normal ale fermentation temperatures (17–23°C). No cold fermentation required. If you want lager character without the ability to hold a fermenter below 15°C for weeks, M54 is the answer.

Best Suited To

• California Common (Steam Beer), American Lager
• Cream Ale, Blonde Ale
• Any beer where a clean, crisp finish is the goal without cold fermentation equipment

Specs

• Fermentation temp: 17–23°C (ale temperature, lager result)
• Attenuation: High
• Flocculation: High
• Alcohol tolerance: Up to 9% ABV
• Pitching rate: 1 sachet per 23L at standard gravity

When to Choose M54

Choose M54 over M84 or M76 when you do not have cold fermentation capability. M84 and M76 produce better results at 8–14°C but stall and produce off-flavours if fermented warm. M54 is specifically designed for warm-fermentation lager.

Choose M54 over M24 Versa Lager when you have no cooling at all and must ferment at normal ale temperatures (17–23°C). M24 performs best with some cooling (10–18°C); M54 is the right choice when there is no cooling available.

Practical Notes

A cold crash after primary fermentation significantly improves clarity with M54, even though primary fermentation was at ale temperature. One week at 2–4°C after primary gets you noticeably closer to lager clarity.

M54 may produce a light sulfury note during active fermentation — normal for lager strains, dissipates during conditioning.

Pitch at 18–20°C and hold steady. Above 23°C the lager character begins to drop away.

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

Reviewed by the AHB Brewing Team — June 2026.