Selection Criteria
Cultivar selection should prioritize repeatability first, then peak performance. A cultivar that performs brilliantly in one lot but inconsistently across seasons is not a production input — it is a liability.
Core Selection Criteria
| Criterion | Why It Matters |
|---|---|
| Performance consistency across lots and seasons | Inconsistent cultivars create process variability that is hard to diagnose and expensive to manage |
| Kernel size and hardness within controllable ranges | Extremes at either end stress milling equipment and steeping protocols |
| Composition aligned to target product and process | Starch, protein, tannin, and lipid profile directly affect extract, foam, flavor, and stability |
| Acceptable defect burden and storage stability | Defect-prone grain degrades during storage and introduces quality risk before it reaches the mash |
| Supplier traceability and documentation quality | Traceability enables contract enforcement and root-cause analysis when batches diverge |
Decision Rules
- Reject cultivars with unstable lot behavior even if top-end performance is high
- Favor cultivars with predictable handling, malting, and brewing response
- Validate using real process data, not only vendor claims
- Define measurable acceptance thresholds before scaling
How to Evaluate a New Grain Candidate
When a grain species or variety is not yet in your program — whether as a malt base, adjunct, or specialty addition — evaluation follows a defined sequence. The criteria below apply to any GF grain candidate, from a new sorghum cultivar to an emerging specialty grain like teff or fonio.
| Step | Evaluate | Disqualifying Signal |
|---|---|---|
| 1 — Malting suitability | Does malting produce better flavor than using it raw, repeatably, at your scale? | No detectable flavor improvement from germination and kilning |
| 2 — Supply chain viability | Can it be sourced at your required volume, purity, and price in North America? | No domestic supply, no lot traceability, or highly speculative pricing |
| 3 — Functional contribution | What measurable extract, flavor, or process benefit does it provide? | Adds a flavor story but introduces process complications |
| 4 — Industry precedent | Has it been used in GF malting or brewing? What does the data say? | No documented use, no existing research — high investment, uncertain return |
| 5 — Candidate ranking | Does it score across all four dimensions, or just one? | Strong on one dimension only = future watch item, not production input |
Step 1 — Malting Suitability
Processing assumption: External enzymes handle conversion. Enzyme activity from malt is a secondary concern. The question is whether malting this grain produces a better flavor outcome than using it unmalted — not whether it produces sufficient diastatic power.
Key variables:
- Does the grain develop favorable flavor compounds during kilning that are not achievable from the raw grain?
- Does kernel size and uniformity support even modification — the driver of flavor consistency, not enzyme yield?
- Is tannin or polyphenol load controlled at the cultivar level, or is it a disqualifying variable?
- Is there research or commercial precedent, or does this require original R&D investment?
If malting does not produce a better flavor outcome than unmalted use, route the grain to adjunct use. Not every GF grain needs to be malted to be useful — and with external enzymes handling conversion, the bar for malting is flavor, not enzyme output.
Step 2 — North America Supply Chain Viability
- Is domestic production available at sufficient volume?
- Is supply chain infrastructure developed enough for lot traceability and GF certification?
- Can pricing remain stable enough to plan against, or is it highly seasonal/speculative?
High potential grains with unstable supply chains are research candidates, not production candidates.
Step 3 — Functional Contribution Assessment
- Starch content: What fermentable extract does this grain realistically contribute?
- Flavor impact: Does it add, neutralize, or interfere with target product flavor?
- Process behavior: Does it introduce complications in milling, mashing, lautering, or fermentation?
A grain that adds a flavor story but complicates processing must clear a higher bar for adoption.
Step 4 — Current Industry Use
Knowing whether a grain is already used in GF malting and brewing tells you two things: whether the science has been done, and where the commercial gaps are.
- Established use: Lower R&D cost, more available data, proven supply chain
- Emerging use: Requires more internal validation, but may offer differentiation
- No documented use: High investment, high risk, potential first-mover advantage — or a dead end
The goal is not to follow the market or ignore it. It is to understand where your program's resources are best applied given your scale and capability.
Step 5 — Candidate Ranking
After evaluating across all four dimensions, rank candidates by practical viability. A grain that scores well on only one dimension is a future watch item, not a current production candidate.
See Comparing Grains for applied evaluation across all current GF grain candidates.