M29 French Saison Yeast
Dry Ale yeast from Mangrove Jack's.
LabMangrove Jack's· Ale · Dry · M29
Specs
Attenuation
85–90%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
26–32°C
79–90°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Medium
How readily the yeast clumps together and drops clear once fermentation winds down.
Alcohol tolerance
≈14% ABV
The rough ABV ceiling where the yeast stresses out and stops fermenting.
Genetic traits
Phenolics
POF+
Clove & spice
Throws phenolics — the clove and spice notes (4-vinyl-guaiacol) behind hefeweizens, witbiers, and saisons. Expect a spicy character, not a clean one.
Diastatic
STA-1+
Finishes bone-dry
Carries the STA1 (diastaticus) gene, so it keeps eating sugars other yeast leave behind and finishes very dry. It's also a contamination risk: it can over-carbonate or gush if it crosses into other beers.
Same strain, other labs
Potential substitutes for M29 French Saison Yeast
Common questions
- What is the M29 French Saison Yeast equivalent?
- B64 Napoleon, LalBrew Belle Saison, OYL-026 French Saison, WLP545 Belgian Strong Ale Yeast, and 3711 French Saison — the same strain from other labs, the Belle Saison / French Saison (3711) strain.
- What is M29 French Saison Yeast's attenuation?
- 85–90% apparent attenuation.
- What temperature should I ferment M29 French Saison Yeast at?
- 26–32°C is the recommended range.
- Does M29 French Saison Yeast produce phenolics (clove and spice)?
- Yes. M29 French Saison Yeast is POF-positive — it makes 4-vinyl-guaiacol, the clove and spice character of hefeweizens, witbiers, and saisons.
- Is M29 French Saison Yeast diastatic (STA-1)?
- Yes. M29 French Saison Yeast carries the STA1 gene (S. cerevisiae var. diastaticus). It super-attenuates to a dry finish, and can over-carbonate or gush if it cross-contaminates other beers.
- What can I substitute for M29 French Saison Yeast?
- LalBrew Abbaye, WLP500 Trappist Ale Yeast, 1214 Belgian Abbey Style Ale, and B53 Precious.
Brew with M29 French Saison Yeast
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