Hops and Yeast for Sorghum Malt
Barley brewers inherit a buffer they rarely think about: a malt-forward, protein-rich, faintly sweet base that softens hop character and gives yeast a familiar nutrient bed. Sorghum malt gives you a cleaner, drier, thinner canvas. Everything you hang on it shows more — which makes hop and yeast choices louder, not quieter, than in a barley beer.
What production actually used
From Bard's production recipe records:
| Selection | Role | Details |
|---|---|---|
| CTZ | Clean bittering, 90 minutes | ~13% alpha; the workhorse bittering charge |
| Sterling | Flavor and aroma, 15 minutes | The character hop; noble-ish, restrained |
| Tetra hop extract | Head retention, not flavor | ~5 IBU of the total, swapped in — the rule and why it works |
| American ale yeast | Clean, neutral fermentation | Fermented at 20.5°C, diacetyl rest at 5°P / 22°C, crashed to 1°C |
| British ale yeast | Warmer, fruitier profile — used where the beer wanted it | Run at the cool bottom of its range (see Tavern Ale Version A) |
Target profile for the flagship: 18 IBU total, five of which came from the tetra extract, on a 10.5°P wort finishing near 4.7% ABV. That bitterness number matters — it is deliberately modest, because on a sorghum base there is less malt sweetness to balance against.
The observation we never got to test
Craig's field experience, stated as experience and not as a finding: German hop varieties worked well with sorghum malt. Some others did not — Saaz in particular clashed.
We do not have controlled data for that, and we are not going to pretend otherwise. What we have is repeated brewing at commercial scale and a consistent impression that certain hop character sat badly on a sorghum base while German varieties integrated cleanly.
A plausible mechanism, offered as hypothesis only: sorghum's thinner body and lower residual sweetness leave hop character less buffered, so varieties whose profile depends on a malty counterweight can read harsh, grassy, or disjointed. That would explain why restrained noble and noble-adjacent varieties tend to sit well. It would also be testable in a weekend by anyone with two kettles.
This is one of the cleanest open questions on this site. Brew the same 100% sorghum malt base, split it, and bitter and finish each half with a different hop variety — one German, one from the group that seemed to clash. Report what happened. Two or three independent reports would turn a twenty-year impression into something the field can actually use. Send results — this one is Research Ask #1.
Yeast: two things that matter more than strain
Gluten status is not optional. Brewing yeast is grown on a substrate, and that substrate is frequently barley wort. A gluten-free beer fermented with yeast propagated on barley wort has a documented gluten pathway. Get the manufacturer's gluten-free statement in writing and keep it with the batch record — the full argument is on Yeast Selection, and the supplier-by-supplier reality is on Yeast Supplier Gluten-Free Statements.
Nutrition is a design input, not an afterthought. Sorghum wort runs roughly half of barley's free amino nitrogen. A strain that ferments barley wort cleanly may throw stress character on sorghum wort at the same pitch rate — which is why production carried a yeast nutrient addition as standard, not as a rescue. See Yeast Nutrition.
How to choose, on a sorghum base
- Start restrained on bitterness. There is less malt sweetness to balance against; what reads as moderate on barley can read as sharp here.
- Swap ~5 IBU to tetra extract for foam, and trim the kettle charge to keep net bitterness on target.
- Prefer varieties that don't need a malt counterweight until you have your own results — noble and noble-adjacent German varieties are where our experience points.
- Verify yeast gluten status in writing, then choose the strain for the beer.
- Plan the nutrient addition with the recipe, not after a stuck fermentation.
- Change one variable per batch and write it down. That is how the impression above becomes evidence.
Related
- The 5 IBU Hop Extract Rule
- Yeast Selection · Yeast Nutrition
- Tavern Ale, Version A — German hops and British ale yeast in practice
- Mash Protocol 1
Source and Validation Notes
Hop varieties, timings, bitterness targets, yeast type, and fermentation temperatures come from Bard's production recipe records. The German-varieties-suit-sorghum and Saaz-clashes observation is Craig's commercial field experience across many batches, not a controlled comparison, and the proposed mechanism behind it is an untested hypothesis stated as such. Alpha acid percentages vary by crop year; treat the recorded value as historical, not as a specification.