The market opened. The megaphone didn’t.

The law is moving, and faster than most people noticed

On 23 April 2026 the Department of Justice moved state-licensed medical cannabis from Schedule I to Schedule III. That is a genuine change in federal posture after fifty years of the opposite. It is also narrower than the headlines suggested, and we have been careful about that on this site since the day it happened: state law governing home cultivation did not change. If your state allowed a home grow the week before, it allows one now. If it did not, rescheduling did not add that right.

It is also not settled. The April order is being challenged in the D.C. Circuit, and a separate expedited hearing on broader rescheduling is still working through the administrative process — the DEA argued in its own post-hearing brief this August that cannabis no longer meets the criteria for Schedule I. Nobody sensible is treating any of this as finished.

Outside the United States the direction is the same and in places further along. Germany has permitted three plants per adult at home since 1 April 2024. Canada has allowed four per household since 2018. Malta and Luxembourg permit home cultivation. The Czech Republic’s law took effect on 1 January this year. South Africa and Thailand both allow some form of it. In the United States, roughly two dozen states plus the District of Columbia permit home growing in some form.

So how many growers is that?

Here is where we are going to disappoint you slightly, and on purpose.

For the United States we did the work. Triangulating consumer surveys, licence counts and equipment-market size, our own April 2026 estimate puts active home growers at roughly 3.5 million, with a defensible range of 2.7 to 5 million. Licensed commercial cultivators — the operators everyone in the trade press writes about — number somewhere around 17,000 and have been shrinking about 8% a year. Home growers outnumber them by something like two hundred to one. If you build for cannabis cultivation and you aim at the commercial market, you have aimed at the small, contracting half.

The number underneath that one is the interesting one. In a 2026 Harris Poll conducted for Royal Queen Seeds, 62% of cannabis consumers said they would rather grow their own than buy it. That is a stated preference and should be read as one — saying you would like to grow is not growing. But against roughly 44 million monthly consumers it describes a gap of tens of millions of people between wanting to and doing it. That gap is friction: not knowing where to start, killing the first plant, not being able to tell a real problem from a plant that is simply young.

Worldwide, we are not going to give you a number, because we do not have one and neither does anyone else. There is no census of home growers. There is no registry, and in most of these jurisdictions the entire point of the law is that you do not have to tell anyone. Any global figure you see is a market-research extrapolation from consumer surveys, and the honest version of that sentence is “hundreds of millions of adults now live somewhere that home cultivation is lawful, and some unknown fraction of them do it.”

We could put a confident-sounding number here. It would be the single easiest paragraph in this post to write. It would also be exactly the kind of claim this company exists not to make.

None of which helps if you cannot say the product exists

Croplock is a box that watches plants. It has no THC in it, sells no cannabis, and would work on a tomato. It is nonetheless cannabis-adjacent, and adjacency is enough.

Google’s advertising policy is unambiguous about the substance: “Ads for substances that alter mental state for the purpose of recreation or otherwise induce ‘highs’ are not allowed.” The one carve-out is topical hemp-derived CBD under 0.3% THC, certified in advance, targetable in three jurisdictions. Meta’s is similar: no ads promoting THC products, and separately, none promoting drug-related paraphernalia.

Read strictly, neither of those policies names a sensor that measures leaf temperature. That is the trap. The written rule is about the substance; what an adjacent product actually meets is enforcement, which is automated, unexplained and applied to the whole category. Cannabis businesses have spent a decade discovering the difference between what a policy says and what a classifier does. The practical planning assumption for anyone in this position is that the two largest advertising channels on earth are closed, and that budgeting for them is budgeting for a rejection you cannot appeal.

How the biggest company in this space gets around it

By not saying the word.

AC Infinity is the dominant brand in home grow equipment and it advertises more or less freely, because on paper it sells grow tents and fans. Its products are horticultural. That the overwhelming majority of them end up growing one particular plant is not something the advertising has to mention. The policy is about the substance, so a company that never names the substance stays outside it.

We arrived at the same place from the other direction, and it is the part of this that we find genuinely interesting. Croplock’s software has no cannabis in it. The domain model is species-neutral all the way down — a plant has a lifecycle, a run has phases, a sensor reports a number. Everything cannabis-specific lives in a swappable knowledge pack, which is also how the same device runs an orchid. We built it that way for engineering reasons: it keeps horticultural fact separate from software structure, and it means a new crop is a data file rather than a fork.

Then it turned out that the architecture is also the advertising passport. The decision that made the codebase clean is the same decision that makes the product describable on platforms that will not let you say what it is for. We did not plan that. We are not sure how we feel about it.

Because the thing being routed around here is not a safety rule. Nobody is protected by the fact that we describe a leaf-temperature sensor without mentioning which leaf. It is a compliance ritual, and every company in this category performs it, and the effect is that an entire industry talks to its customers in code.

The channels that do work are the ones you have to pay for

This is not a story about having no options. There is a whole parallel advertising economy in cannabis, and it functions: the endemic ad networks, the cultivation forums that have run banner placements for twenty years, the grow-focused YouTube channels with fifty to three hundred thousand subscribers who take flat-fee sponsorships. When we scored the available channels earlier this year, the top of the list was not Google — it was grow creators, cultivation forums, and Reddit’s own self-serve ads, precisely because none of them can suspend your account for being what you are.

Every one of those is a paid placement. They are not expensive by advertising standards. They are still money, and Croplock is bootstrapped and building to order, which puts them a step further out than we would like.

So the well-known half of the problem is that the free-at-scale channels are closed by policy. The half that surprised us is that the genuinely free channels — the communities where you participate rather than advertise — are harder still.

What we actually hit, this week

We spent a day trying to tell the self-hosting and privacy communities that a fully local grow monitor exists. These are people whose stated values the product matches exactly: nothing leaves the LAN, no account, no telemetry. We read every community’s rules at source before writing a word. Here is what came back.

• r/privacy forbids promotional posts outright, and says violating it “can result in an immediate ban without warning.” A separate rule bars promotion of closed-source privacy software. A third puts app posts on hold entirely. There is no compliant version of any post we could write.
• r/selfhosted requires that a promoted project be production-ready with docs. We have no public repository and nothing you can install, so we do not qualify — and that is the correct reading, not an obstacle to route around.
• r/homelab permits non-commercial personal projects and prohibits company advertising. A product with a price is the second thing.
• Hacker News worked, and is worth being precise about. The post reached 3 points. It also put dozens of real people on this site inside an hour, and the ones who read past the first page went to the post about our device getting it wrong rather than to anything describing the product.

And on the grower side, where the actual customers are: r/microgrowery removes AI-generated comments. Which is correct of them, and which means the only way to be useful there is for a human being to read the photographs and type the answer. That is slow on purpose. It does not scale, and it should not.

The part worth generalising

It would be comfortable to file all of this under stigma. It mostly is not.

Not one of those subreddit rules mentions cannabis. They are rules against promotion — written by communities that got tired of being marketed to, and enforced consistently against everyone. On the same day our post was blocked, two fully open-source projects with public repositories and real documentation were sitting at zero points on r/selfhosted for the crime of being announced by their own authors.

So the accurate description is not “cannabis is banned everywhere.” It is that the mainstream paid channels are closed by policy, the free communities are closed by rule, the channels that remain open want money, and the adjacency removes every exception you would otherwise have. A normal hardware startup that cannot post to r/selfhosted still buys Google ads. A funded cannabis company that cannot buy Google ads still sponsors a grow channel. We are the intersection, and the failures compound instead of substituting.

What is left is the oldest channel there is, and it happens to be the one this product is actually suited to: somebody grows something, it works, and they tell somebody else. It is slow. It cannot be bought. It is also the only one that has moved anything for us so far — every person on our waitlist arrived because of something written honestly rather than something targeted at them.

Which is the ask

If you have read this far, you are the distribution.

Tell one grower. Not a crowd — one person you actually know who grows, or has said they would like to and never started. Send them croplock.com, or better, send them the answers pages, which are free, have no signup, and are useful whether or not they ever buy anything from us. If you are technical rather than horticultural, the engineering log is the honest version of what is inside the box.

And if you think we are wrong about any of it — the market read, the legal read, the device — we would rather hear that than not. Everything on this site is written to be checkable for exactly that reason.

Nothing here is legal advice, and federal and state cannabis law continues to change; check your own jurisdiction. US grower figures are our own April 2026 estimate from public survey, licensing and market data, with a stated range and medium-high confidence — not a measurement. The 62% figure is a stated preference from a 2026 Harris Poll conducted for Royal Queen Seeds. Advertising-policy quotations are from Google’s and Meta’s published policies as of 8 September 2026. The community-rule findings and the Hacker News result are our own, from the same date.