Thailand regulates fertiliser under its own statute, separately from cannabis law. Its penalties are heavier than most growers assume: imprisonment measured in years, not a fine and a warning. It applies to every bag and bottle in your store room regardless of brand, and it reaches the seller and the importer as well as the manufacturer. This article sets out what the Act covers, what a legal supplier must hold, what the label must carry, and the penalty ranges. It is brand-neutral. It also draws one distinction that a grower building a GACP or export file cannot afford to get wrong: a registration shows a product is legal to trade, a guaranteed analysis shows what is in it, and neither one substitutes for the other.
1. Disclosure, sources and limits
The account posting this, AZ_Growshop_Asia, belongs to a fertiliser importer and distributor in Thailand. We are describing a regime we are subject to ourselves. Everything below applies to us exactly as it does to any competitor, including the questions it tells you to ask a supplier.
Sources and limits. The governing law is the Fertilisers Act B.E. 2518 (1975), amended by the Fertilizer Act (No. 2) B.E. 2550 (2007). We could not confirm from the Royal Gazette whether any later amendment exists. The section numbers, validity periods and penalty ranges below come from an unofficial English translation of the Act as amended up to 2007. We could not check them against the current consolidated Thai text, so some may have changed. For a compliance file, a contract term or a dispute, use the current Thai text from the Department of Agriculture (DOA) and, if it matters, a Thai lawyer. Nothing here is legal advice.
2. What the Act covers
The Act defines four categories of fertiliser (section 3 of the translation):
- Chemical fertiliser: derived from inorganic or synthetic organic substances
- Bio fertiliser: using microorganisms to create nutrients
- Organic fertiliser: made from organic substances broken down by microorganisms
- Organic-chemical fertiliser: a combination, at prescribed nutrient and organic ratios
Why the categories matter. A cannabis grower’s store room usually spans at least three of them. Mineral base nutrients and pH adjusters are chemical, a microbial inoculant is a bio fertiliser, and a guano or humate product is organic. They are not regulated identically. Label requirements differ by category (section 4), so “is my fertiliser legal” is really several questions.
3. What a legal supplier must hold
There are two distinct things here, and growers routinely mix them up.
A licence, for the activity. Importing fertiliser into the Kingdom and selling it are both licensed activities (the licensing provisions, sections 12–18 of the translation). In the translation, a sales licence is valid for one year and an import licence for up to one year. We have not confirmed whether the 2019 amendment changed these periods. Ask the supplier for the expiry date printed on their licence rather than assuming one.
A registration, for the product itself. As we read the translation, registration attaches to the product. Each fertiliser that a licensed manufacturer or importer intends to trade must be registered before it is manufactured or imported for sale. The translation gives the registration certificate a five-year, renewable term. Check this against the current Thai text as well.
Registration is not a composition disclosure. Composition and analysis data go into the registration application, which is a file submitted to the authority. That file is not a buyer-facing document, and a registration will not give you a composition the manufacturer has not published. (That buyers cannot obtain the file is our experience as a distributor, not a provision of the Act.) What a supplier can hand you is the registration reference and the certificate, and those establish legality.
Licence and registration are separate documents. They are issued to different things, so a supplier can hold a valid product registration while its own licence to import or sell has lapsed. “This product is registered” and “this company may legally sell it to you” are different statements. A grower who checks only the first has checked the easier half.
Two questions to ask any supplier:
- “What is the DOA registration reference for this product, can I have a copy of the certificate, and are your import and sales licences current?” This is the legality question.
- “What is the guaranteed analysis, and where does the manufacturer publish it?” This is the content question. “The manufacturer does not publish one” is a real answer. Record it as such rather than leaving the field blank.
The answers to both are documents with identifiers. A supplier who says “yes, it’s all legal” and produces nothing has told you nothing you can check.
4. What the label must carry
By category (sections 21(4), 21/1(4) and 21/2(4) of the translation):
- Chemical fertiliser: trade name, guaranteed quantity of nutrients, net weight, manufacturer details, and toxic substance information
- Bio fertiliser: guaranteed quantity of microorganisms, expiration date, and carrier information
- Organic fertiliser: guaranteed quantity of organic substances
A label declaration is not a manufacturer datasheet. A chemical fertiliser’s label should carry the nutrient figures the Act names for its category. It does not cover ingredients outside those categories, and a product sold as an additive may declare something quite different. The guaranteed analysis (on the label, a datasheet or the manufacturer’s product page) is the only thing that tells you what is in the container and at what concentration. A product can be fully legal and still have no published composition. That is not a contradiction: they are two separate facts about the same bottle. Where no analysis is published, the honest position is that it is not published. Nothing in this Act closes that gap.
Bio fertilisers must carry an expiration date. This is the one category where the Act names a date requirement. A microbial inoculant with no expiry on the label is a specific problem you can check.
Whether the label must show a registration number is not confirmed. The translation’s label sections do not appear to require one, but an unofficial translation is the wrong basis for a claim about what must be printed on a bag. Ask for the registration document instead of looking for a number on the packaging.
5. The penalties
Ranges per the unofficial consolidated translation of the Act as amended to 2007. They may not reflect the 2019 amendment, so check the current Thai text before relying on any figure.
| Offence | Penalty | Section (translation) |
|---|---|---|
| Manufacturing unregistered fertiliser | imprisonment 1–5 years and a fine of 40,000–200,000 baht | 71 |
| Selling unregistered fertiliser | imprisonment 6 months–3 years or a fine of 20,000–120,000 baht | 72 |
| Manufacturing substandard fertiliser | imprisonment 2–5 years and a fine of 80,000–200,000 baht | 66 |
| Selling or importing substandard fertiliser | imprisonment 6 months–3 years or a fine of 40,000–200,000 baht | 67 |
In the translation, the prohibitions behind these penalties sit in section 30: substandard fertiliser at 30(2) and unregistered fertiliser at 30(5).
Three observations:
- Manufacturing carries imprisonment and a fine. Selling and importing carry imprisonment or a fine. The gradation shows where the statute places primary responsibility.
- “Substandard” is the heavier manufacturing offence (2–5 years against 1–5, with a higher minimum fine). A registered product that fails its declared analysis carries a false guarantee. An unregistered one simply lacks a guarantee.
- A grower is not a seller, but reselling may change that. Selling fertiliser is a licensed activity (sections 12–18 of the translation). A grower who resells surplus inputs to a neighbouring farm may therefore be treated as a seller under those provisions. We have not seen how the DOA applies this to occasional small sales, so ask the DOA before doing it.
6. Why this belongs in a GACP or export file
If you grow to a standard rather than for yourself, input provenance is a required element, not optional paperwork.
What an auditor asks for. Which inputs were applied, at what rate, on what date, from whom, and with what documentation for each input. The registration reference shows the input was legal. The guaranteed analysis shows what was applied. An input log needs both, and a log with only a product name has neither.
Where it gets expensive. Residue and heavy-metal findings are traced backwards through inputs. In our view, a grower who can name the registered product and produce its declared analysis can narrow the problem to one input. A grower who cannot has to treat every input as a suspect. In an export context, that can decide whether a consignment is a contained incident or a total loss. This is the practical logic of traceability, not a provision of the Act.
Unpublished compositions. If a product has no published analysis, your record for it can only say what the label says. That is not a reason to avoid the product. It is a reason to know which of your inputs are in that state before an auditor finds out.
A cheap habit that makes it work. Keep one sheet per product in your store room with:
- product name
- category under the Act
- registration reference
- supplier
- declared analysis, or the words not published by the manufacturer (a legitimate entry)
- for bio fertilisers, the expiry date from the label
Build it once and update it when a product changes. It answers most of what an auditor will ask about inputs.
7. What this article does not settle
- What the 2019 amendment changed. That includes licence periods, registration terms, section numbering and penalty ranges. All need checking against the current Thai text.
- Whether a registration number must appear on the label.
- The current fee schedule, application route and processing time for import and sales licences. We have not verified these.
- How the Act interacts with cannabis licensing. As far as the text goes, it does not. Fertiliser law and cannabis law are separate regimes, and a legal fertiliser says nothing about whether your cultivation is licensed.
- Enforcement practice. Statutory ranges are not the same as sentences actually imposed. We have no data on Thai enforcement of these sections.
Two things worth posting if you have them. First, what a DOA registration document looks like and how long it took to get one from a supplier. Second: has an auditor ever queried an input entry because it had no manufacturer analysis, and what did you show them instead?
Sources
- Fertilisers Act B.E. 2518 (1975) as amended by Fertilizer Act (No. 2) B.E. 2550 (2007), unofficial English translation via FAOLEX: https://faolex.fao.org/docs/pdf/tha181029.pdf
- Thai government guide, documentation for fertiliser import permission: https://thailand.go.th/guide-book-detail/001_03_297
Related reading: a separate Advanced Nutrients series on the forum, which covers products whose composition is not published; the forum’s topics on Thai cannabis regulation; mixing your own nutrient solution from raw salts.
This article is general information about Thai fertiliser regulation, based on an unofficial English translation of the Act. It is not legal advice. Cannabis is regulated separately. In Thailand, cannabis flower is a controlled herb under the Notification of the Ministry of Public Health Re: Controlled Herbs (Cannabis) B.E. 2568. It may be dispensed only against a prescription, and it may not be sold or advertised online. The Cannabis Control Act is still a draft.