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
Usually used in
Saison
Standard for these styles
Styles where M29 French Saison Yeast is a standard pick — from the corpus, not the guidelines.
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 beer styles is M29 French Saison Yeast good for?
- Saison.
- What can I substitute for M29 French Saison Yeast?
- LalBrew Abbaye (also phenolic), WLP500 Trappist Ale Yeast (also phenolic), and 1214 Belgian Abbey Style Ale (similar temperature range, also phenolic).
Brew with M29 French Saison Yeast
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