Are Microgreens Legally Sprouts? The Subpart M Question

No. FDA states directly that because microgreens are not sprouts, they are not subject to Subpart M. But the line is drawn by what you actually harvest, not by what you print on the clamshell.

This is the single most expensive misunderstanding in the microgreens trade. Growers are told, repeatedly and confidently, that they face sprout rules. Sprout rules mean a fully enclosed building, treated seed, pathogen testing on every single batch, monthly Listeria swabbing, and product that cannot ship until the lab says it is clean. A grower who believes that and complies with it is spending money on obligations the federal government never placed on them.

The reverse error is worse. A grower whose product genuinely is a sprout, sold as microgreens, is missing mandatory controls that exist because people have died.

So it is worth getting precise. Below is what FDA actually says, where the line sits, and what moves a crop across it.

What FDA actually uses to tell them apart

FDA's operative distinction is the growth stage of the leaves. Its historical primary criterion is that sprouts are usually harvested when the cotyledons, the seed leaves, are still undeveloped or underdeveloped and true leaves have not begun to emerge. A microgreen is taken at a later stage, the one typically associated with the emergence of true leaves. That is stated in FDA's sprout guidance and carried through the Federal Register comment and response record for the final rule.

Read that again, because it does not match how the industry talks. The distinction is not broccoli versus pea. It is not soil versus mat. It is not tray depth or days to harvest. Broccoli can be a sprout or a microgreen, and the answer depends entirely on the condition of the product when you cut it.

This is a stricter and cleaner test than the gardening shorthand that calls every germinated seedling a sprout. That shorthand is where most of the confusion comes from. Growers hear "sprout" used loosely in a Facebook group and reason their way into a compliance burden nobody imposed.

Two observations at harvest, in order

For a working grower there are exactly two things to look at.

First, the leaves. A sprout is generally taken before true leaves emerge. A microgreen is taken at the later, true leaf associated stage. This is the primary sort and it happens before anything else.

Second, the cut line and what you sell. This one only matters once the product is on the sprout side of the first test, and it is the piece almost nobody explains correctly. 21 CFR 112.141 applies Subpart M to all sprouts except soil or substrate grown sprouts harvested without their roots. FDA explains that the excluded product is cut above the soil or substrate line, so the roots are not harvested for human consumption. In an ordinary microgreen harvest, the seed and root mass and the growing medium stay in the tray, and the stem and leaves above the line go into the bag.

A soil or substrate grown product harvested with its roots does not get that exception. FDA says rooted soil or substrate grown sprouts are ordinarily subject to Subpart M.

Do not stretch this into a rule that every seed hull must physically fall away. FDA's stated federal tests are the developmental stage of the product and, for the 112.141 exclusion, soil or substrate plus a harvest without roots. What a careful grower keeps is a written harvest procedure stating that the product is cut above the medium, that roots and medium are discarded, and that the product is marketed as a microgreen at the true leaf stage.

The obligations that actually differ

Here is the practical shape of the gap, which is the whole reason the classification matters.

Sources for that table: 21 CFR 112.142 through 112.148 in the final rule and FDA Compliance Program 7303.060. Checked 7 August 2026.

The difference is not a fee or a form. It is a set of recurring, compulsory controls with a hold on your ability to sell attached to them.

Every production batch means every production batch

This is where growers who assume the sprout rules apply feel the cost most sharply, so it is worth stating exactly.

For each production batch, 112.144(b) requires testing of spent sprout irrigation water for E. coli O157:H7 and Salmonella species. Where that testing is not practicable, and FDA gives soil grown rooted sprouts and hydroponic sprouts using very little water as its examples, the grower must instead test each batch's sprouts while they are still growing. A further pathogen is required only when both conditions in 112.144(c) are met, meaning testing is reasonably necessary to reduce the risk of serious adverse health consequences or death and a scientifically valid method exists for the sample type.

Section 112.147 removes any ambiguity about frequency. The written plan has to identify a representative sample number and location for each production batch, samples must be collected aseptically by an allowed method, and the batch may not enter commerce unless results are negative.

A production batch is not a monthly composite. FDA made exactly that point in a 2024 warning letter, explaining that each planting started at the same time in one growing unit was at least one batch. See the Korean Food warning letter.

The environmental side is separate and runs in parallel. The plan must be written, designed to find Listeria monocytogenes if it is present, and must specify whether testing targets Listeria species or L. monocytogenes, the production timing and frequency, and enough food contact and non food contact locations to show whether controls are working. Minimum frequency is monthly. The plan also has to say how and when the corrective actions in 112.146 will happen after a positive: investigate adjacent areas and niches, clean and sanitize, resample to establish elimination, run finished product testing where appropriate, prevent recurrence, and keep adulterated food out of commerce. All of that is in 112.145 and 112.146.

Records under 112.150 include seed treatment or supplier certificates, monitoring plans and results, sampling plans and results, and documented corrective actions. Part 112 records generally must be accurate, dated, signed or initialed as applicable, available, and retained at least two years after creation, with analyses, sampling and action plan records retained at least two years after their use is discontinued, under 112.164. Those two year periods are fixed. Nothing about them is inflation adjusted.

The compliance dates were never the same either

The original Part 112 dates are fixed historical dates, and sprouts were always pulled a year forward of everyone else.

Dates from FDA's FSMA compliance dates page, confirmed 7 August 2026.

One warning about that table, because it is misread constantly. The dollar bands are the Part 112 statutory categories. They are not a current flat coverage threshold. The 25,000 dollar benchmark in 112.4(a) is a 2011 dollar figure and FDA inflation adjusts it, publishing the current cutoffs separately. If you are working out whether the rule reaches you at all, use the current adjusted figure, which is covered on the Produce Safety Rule page.

All three Subpart M dates have passed. That matters more than it sounds, because an operation newly determined to be producing covered sprouts is already required to comply. It does not get a runway. It also does not get the later timetable that non-sprout produce received for pre-harvest agricultural water, and FDA states that the 2024 changes to pre-harvest agricultural water requirements for non-sprout covered produce did not substantively alter the agricultural water standards for sprouts.

What actually moves a crop across the line

Reclassification risk comes from the product and the process, not from the word on the label. Treat each of the following as a signal to stop and do a documented Part 112 analysis before you sell.

The safe federal position is short. Cut true leaf associated microgreens above the substrate. Do not sell the roots or the medium. Keep a clear written product and harvest description. If you are selling a rooted or water grown cotyledon stage product, assume it may be a Subpart M sprout until FDA or qualified food regulatory counsel tells you otherwise.

The live tray question

Live trays are the honest gray area, and the answer is more nuanced than either camp online will tell you.

At the federal level, a live tray with roots intact is not automatically a transformation from microgreen into sprout simply because the customer makes the final cut. It is still the leaf stage that sorts the product first. But the live tray does remove the ordinary 112.141 rootless harvest condition, and FDA says rooted soil or substrate grown sprouts are ordinarily subject to Subpart M.

FDA announces enforcement discretion in one narrow situation: sales to a commercial entity that will cut above the soil or substrate line before use, and only where the sprout operation annually obtains that entity's written assurance. That is discretion exercised by the agency, not a blanket exemption for retail or live tray sales. A plain language summary of how this lands on a farm is in the University of New Hampshire Extension write-up.

For a true leaf microgreen sold live in a tray, the leaf stage test has already answered the question. The tray is not what decides it. The trouble starts when a live tray is also cotyledon stage.

Both errors cost, and one costs more

Over-complying with Subpart M when you do not have to is a real and quantifiable waste: enclosed production space, seed treatment or supplier certificates, environmental sampling at least monthly, batch by batch pathogen testing, written plans and recordkeeping, and a release hold on every batch until results come back. The time cost is as real as the lab bill, because product cannot move while it waits, and a positive result triggers holds, sanitation, investigation, retesting and possibly destroyed product and seed. There is no universal dollar figure for this, because lab pricing, batch size, product and facility costs all vary. What is verifiable is the frequency and the release condition, and those are set out in 112.142 through 112.148.

None of that means those practices are bad. Many of them are sensible voluntary controls. The point is narrower: Subpart M's mandatory testing, written plan and facility provisions are not federally required just because a product is called a microgreen, and a microgreen remains covered produce regardless.

Under-complying is the more serious failure. If the product is in fact a covered Subpart M sprout and the operation releases it as ordinary microgreens, it misses every batch pathogen testing, monthly environmental monitoring, seed controls, the sanitation and facility standards, and the rule that nothing ships before a negative result. FDA's inspection program calls for regulatory action where findings or sampling results warrant it. The 2025 Jack and The Green Sprouts warning letter states that Part 112 violations caused sprouts to be adulterated under section 402(a)(4) of the Federal Food, Drug, and Cosmetic Act, and that failure to comply with the produce safety regulation is a prohibited act under section 301(vv).

There is also liability exposure that has nothing to do with which subpart applies. FDA reports 52 United States sprout associated foodborne illness outbreaks from 1996 through 2020, estimated at at least 2,700 illnesses, 200 hospitalizations and three deaths. Those are fixed historical figures. Calling a product something else does not protect a grower from a recall, a customer claim, an insurer, or a finding that food was prepared or held under insanitary conditions.

One honest note on the enforcement record. There is published FDA action against sprout operations for Subpart M failures, including the 2024 Korean Food letter and the 2025 Jack and The Green Sprouts letter. I did not find a published FDA warning letter or enforcement action whose holding turns on FDA reclassifying a seller's product from microgreens to sprouts. Read that as an absence of published cases, not as permission to self classify a borderline rooted or hydroponic product without asking.

How to get an answer that holds

No individual FDA staff member issues a private, generally binding classification letter that replaces the regulation. The binding text is 21 CFR Part 112 as FDA applies it, and what settles a genuine dispute is a final agency enforcement action or a court decision, not an informal phone answer.

The prescribed route for an implementation question is FDA's FSMA Technical Assistance Network, where inquiries are answered by FDA information specialists or subject matter experts and assigned a case number.

Put the facts into the question, not just the crop name:

Then ask it directly: based on these facts, does FDA consider this product a sprout subject to 21 CFR Part 112 Subpart M, or non-sprout covered produce? Keep the question, the case number and the response. If you are facing enforcement or launching something significant, get food regulatory counsel as well.

If a state produce safety program has told you something different about rooted trays, take that seriously as a state matter and ask them in writing. A state answer does not change the federal analysis on this page, but it can still govern what you are allowed to sell there.

Preserve the paperwork either way: crop stage photographs, growing medium records, harvest procedures, product labels and sales format. FDA's sprout inspection program directs investigators to use FDA's Determining Coverage under Subpart M flowchart, and says that non-sprout produce such as microgreens should not be inspected under that program, which is precisely why documenting your side of the line is worth the effort. See Compliance Program 7303.060.

Frequently Asked Questions

Q: I grow broccoli microgreens. Are those sprouts? A: Not because they are broccoli. FDA sorts by the growth stage of the leaves, not the species. Broccoli can be either. If you harvest at the true leaf associated stage and cut above the medium, that is a microgreen. If you harvest at the cotyledon stage with roots attached, the sprout analysis applies.

Q: My microgreens grow on hemp mats with no soil. Does that make them sprouts? A: Not by itself, because leaf stage sorts the product first. But be careful if your product is also cotyledon stage, because FDA's inspection program says Subpart M covers all hydroponically grown sprouts and the 112.141 exception only exists for soil or substrate grown product harvested without roots.

Q: I sell live trays with roots intact. Am I now a sprout operation? A: Not automatically. But you have given up the rootless harvest condition, and FDA says rooted soil or substrate grown sprouts are ordinarily subject to Subpart M. FDA's enforcement discretion here is narrow: sales to a commercial entity that will cut above the medium, with that entity's written assurance obtained annually.

Q: If Subpart M does not apply, am I free of federal food safety rules? A: No. FDA is explicit that microgreens remain covered produce and are subject to the other applicable Produce Safety Rule subparts unless excluded or exempt under Subpart A. Not a sprout is not the same as not regulated.

Q: Can I just test monthly instead of every batch to be safe? A: If you are genuinely a covered sprout operation, no. Section 112.147 ties sampling to each production batch and holds the batch out of commerce until results are negative, and FDA made that point directly in the Korean Food warning letter. If you are not a covered sprout operation, none of it is federally required in the first place.

Final thoughts

The federal answer is short and it has been in writing since the rule was finalised. Microgreens are not sprouts, and Subpart M does not apply to them. What applies instead is the rest of the Produce Safety Rule, and for most small growers even that turns on a sales threshold they are comfortably under.

What you owe yourself is precision about your own product. Cut above the medium. Harvest at the true leaf stage. Do not sell roots as food. Write down that this is what you do, and keep photographs. Those four habits are the whole defense, and they cost nothing.

If a supplier, a buyer, an insurer, or an extension agent tells you that you need batch pathogen testing and an enclosed building for cut true leaf microgreens, ask them which provision they are reading. If something on this page conflicts with what an agency told you in writing, tell me and I will check it. A page that is wrong about a rule is worse than no page.

Sources

Every claim above traces to one of these. All checked 7 August 2026.