One Readiness Number Is Not Enough

A growth chamber can hold temperature, light, water, and carbon dioxide exactly as commanded while producing food a crew should not eat. A cultivar can thrive in a terrestrial laboratory and fail when placed inside unfamiliar hardware. If both stories collapse into one readiness number, the number hides the risk it is supposed to communicate.

Technology Readiness Level describes the maturity of the hardware and its supporting technology. NASA's Crop Readiness Level asks a different question: how far has a named crop progressed from candidate identification toward successful crew consumption in its intended setting?

NASA and commercial developers already share both vocabularies. The question is whether they will report them side by side.

NASA researchers proposed the nine-level CRL scale in 2019 and later published Version 2.0 [1,2]. The progression begins with crop identification and cultivar screening. It then moves through testing under relevant temperature, humidity, carbon dioxide, and light; baseline microbiology; nutrient chemistry and sensory acceptance; seed or propagule sanitation; operation in flight-like hardware; growth in space; and, finally, consumption in space with acceptable performance. Some activities may proceed in parallel when the program warrants it, but the logic remains sequential: a plant must become a safe, usable food, not merely living biomass.

The scale corrects three common errors. First, successful growth does not establish food readiness. A healthy canopy says little about microbial release criteria, sanitation, harvest losses, nutrient contribution, preparation burden, or whether anyone wants to eat it. Second, one space experiment does not automatically carry every included cultivar to the highest level. The crop must reach its stated endpoint, and the final level requires consumption. Third, maturity does not transfer across the crop and hardware boundary.

That last distinction is the one most likely to blur in a commercial pitch. A chamber with an established operating record can hold an early-stage cultivar. A crop studied extensively in one system can enter new hardware that changes root wetting, airflow, surface contact, sanitation, and crew interaction. The integrated crop-system pairing inherits the uncertainties of both sides, not the highest score available from either.

NASA's microgreens research shows how CRL creates discipline. A 2023 Kennedy Space Center study screened 60 species and advanced 18 cultivars for deeper work. The paper reported the testing it described at CRL 3. It then cited separate 2022 work as moving those crops to CRL 4 and identified flight-forward hardware plus further food-safety testing as next needs [3]. The careful reading matters. The later CRL 4 work cannot be backdated into the CRL 3 experiment, and the crop's progress cannot confer maturity on hardware it has not used.

The same rule applies to Gastronaut. ORCA is a cultivation platform, so its engineering status belongs in the TRL column. Gastronaut currently describes ORCA as a ground-stage system at approximately TRL 3 to 4. It has not flown. A named cultivar grown inside ORCA belongs in a separate CRL column, and Gastronaut has not completed a formal public CRL assessment for such a pairing.

That is not a paperwork gap. A defensible assessment must name the cultivar, destination, mission duration, atmosphere, gravity condition, hardware configuration, food-safety criterion, nutrient target, and consumption endpoint. “Microgreens in ORCA” is too broad because microgreens differ from one another, and ORCA operating conditions can differ among use cases. A cultivar intended as an occasional fresh supplement may follow a different path from the same cultivar proposed as a recurring source of a target nutrient.

The two-column record would change NASA's decision process in a useful way. For each candidate, reviewers could ask what remains unresolved in the hardware, what remains unresolved in the crop, and what emerges only when they interact. A sanitation method may be mature for a seed lot but incompatible with a new substrate. A stable chamber atmosphere may still allow a canopy-level humidity pocket. A palatable crop may require harvest steps that exceed the crew-time budget.

That view also exposes the critical path. If the chamber needs an airflow redesign, repeating sensory work may add little. If the cultivar fails microbial criteria, raising the hardware score cannot rescue it. If both tracks look sound separately but the integrated root zone floods, the pairing has created a new failure mode. The next test should follow the limiting track, not the most convenient laboratory schedule.

That is readiness used as a decision record.

It would also allocate scarce lunar opportunities more intelligently. Germination, morphology, microbial baselines, chemical assays, sensory work, and many integrated failures belong on Earth. An uncrewed lunar payload can test the crop-system pair under the real surface environment without pretending to answer a consumption question. A crewed study should be reserved for the endpoints that require actual handling, eating, acceptability, or human exposure.

Gastronaut has prepared a Crop Readiness Self-Assessment for exactly this conversation. A focused 90-minute session with NASA crop researchers could score one named microgreen against the controlling CRL version, place ORCA evidence in the separate hardware column, and identify the smallest test package that would support the crop's next level in ORCA-class hardware. NASA would be evaluating the evidence structure and requirements, not conferring a label.

A fair objection is that two frameworks can add process without improving a plant or a machine. That is true if the scores become badges. It is false if each level carries a failed criterion, a source record, and a next test. The purpose of CRL is not to reward motion up a ladder. It is to stop crop biology from disappearing inside hardware progress.

On a lunar mission, the crew will not eat a technology level. They will eat a particular cultivar grown, sanitized, harvested, and served through a particular system. The readiness record should name both.

Research foundation and evidence boundaries

The CRL history and level structure come from the cited NASA records. Gastronaut owns the proposed two-column reporting structure and its self-assessment artifact. CRL must be applied using the controlling version and a named cultivar; hardware TRL cannot be transferred to crop maturity. Gastronaut has not completed a formal public CRL assessment for an ORCA crop-system pairing. ORCA is approximately TRL 3 to 4, is ground-stage, and has not flown.

References

1. Romeyn et al., “Crop Readiness Level (CRL): A Scale to Track Progression of Crop Testing for Space” (2019), NASA document 20190027123. NTRS record
2. Fritsche, Ralph, et al., Space Crop Considerations for Human Exploration. NASA/TM-20250001897. Includes the Crop Readiness Level Version 2.0 table. NTRS record
3. Spencer et al., “Novel Microgreen Crop Testing for Space” (2023), NASA document 20230007372. NTRS record