“Are Thai seed banks on Shopee legit?” is the opening line of a nineteen-reply thread on an expat forum. The first substantive answer is “Don’t buy seeds from Thai vendors, almost nothing is legit.” Other threads report seed that was not as described. Some growers also report that copied foreign strain names are common on local listings. This article does not name vendors to avoid, because grower reports are no basis for such a list. It sets out what a buyer can actually check, and which of the three common complaints can be verified and which cannot.
Disclosure: the author’s account is a seed seller. This article names no vendor and recommends none, including the author’s own.
1. The evidence
Several threads over several years repeat the same complaints. One (“Weed Hobbyist”) opens with the Shopee question and the “almost nothing is legit” answer. Later in the same thread, another member recommends an authorised distributor of named international breeders. In another thread (“They Just Can’t Grow It Right!”), a grower says that none of the seed they bought in Thailand was as claimed. Others simply ask where to buy.
The reports agree across threads and years, which is why the topic is worth writing about. But this is expatriate grower opinion, not an audit. There is no survey, no test-purchase programme and no measured rate of mislabelling. Also note that the thread that opens with “almost nothing is legit” includes a counter-recommendation. The complaint is not that no legitimate vendor exists in Thailand. It is that the buyer cannot tell from the listing.
Source note: threads on the ASEANNOW forum, e.g. https://aseannow.com/topic/1280414-weed-hobbyist/ and https://aseannow.com/topic/1319046-they-just-cant-grow-it-right/.
2. Three problems, with very different verifiability
The reports bundle three complaints together. They are different problems, and they need different remedies.
Problem one: the feminisation claim
What is claimed: the seeds are feminised, so they should produce female plants at a high rate.
How feminised seed is made: a female plant is induced to produce pollen. This is done chemically, with silver thiosulfate or colloidal silver, or by delaying harvest so the plant self-pollinates (rodelization). Done properly, feminisation gives a very high but not perfect female rate. Done badly, it can give males and, less obviously, plants more prone to intersex expression.
Verifiability: high, but only after the fact. Count males and intersex plants per pack. This is the one complaint that produces hard numbers within a single grow cycle.
The regional complication: intersex expression has environmental as well as genetic causes. Growers widely report that heat and light stress increase it, and some studies have shown that environmental stress can trigger intersex flowers. The evidence for heat specifically is mostly anecdotal. So a hermaphrodite in a Thai tent could mean bad seed or a stressed environment. An intersex plant can only be blamed on the seed if you can show your environment was not the cause. Log canopy temperature and check for light leaks before you blame a vendor.
Problem two: copied strain names
What is claimed: the seed is a named strain from a known breeder.
Verifiability: essentially zero without genetic testing. A packet with a famous strain name may contain that strain, a cross of it, or something unrelated. Any real seed line varies a lot in phenotype. So an unexpected plant does not prove mislabelling, and a plausible one does not prove authenticity.
This is the complaint buyers can do least about. The fix is in where you buy, not in what you can test. Buy from the breeder or from an authorised distributor of that breeder, where the name carries a contractual meaning.
Some context: strain names are often not registered, and unrelated breeders sell seed under the same name. Much of what looks like copying is therefore normal across the industry, not something unique to Thailand. The local reports probably describe the same problem in a stronger form. The useful response is to stop treating the name as information. Buy on the breeder’s reputation and the described traits.
Problem three: stock age
What is claimed: implicitly, that the seed is viable.
Verifiability: high. This is the most tractable of the three.
Seed longevity depends mainly on moisture content and storage temperature. Thailand is close to the worst environment for storing seed. Constant high humidity and high temperature both shorten viability, so stock kept in an unconditioned shop or warehouse keeps degrading. This describes a mechanism, not a vendor’s honesty. It applies to honest vendors too, and to imported seed sitting in a local warehouse however good it was when it shipped. It also means seed becomes “old stock” sooner here than in Europe.
What you can check: the germination rate, recorded per pack. A rate well below the breeder’s stated figure is your evidence, and you need no laboratory to get it.
3. What to check before buying
- Ask how and where the seed was stored. A vendor who can answer (refrigerated, sealed, humidity-controlled) is telling you something meaningful. So is a vendor who cannot.
- Ask for the breeder, not the strain. “Which breeder produced this pack?” is much harder to answer vaguely than “What strain is this?”
- Prefer authorised distributors of a named breeder. An authorised distributor has a relationship with the breeder that a marketplace listing does not. If the breeder publishes a distributor list, check the seller against it. Do not just take the seller’s word for it, and that includes this author.
- Buy small first. One pack from a new vendor, germinated and grown out, is a cheap test. Buying in bulk for a discount is exactly the wrong move with a vendor you have not checked.
- Be sceptical of marketplace listings. The threads name Shopee-type listings as the least reliable channel. Marketplaces do not check sellers’ horticultural claims, and the seller of record may not be the source of the seed.
- Check the packaging and pack date. You can compare a breeder pack with a batch or pack date against the germination you get. You cannot do that with a hand-filled, unmarked bag.
4. What to record, so the next buyer benefits
Years of threads have not settled anything because nobody records numbers. Record four fields per pack:
| Field | Why |
|---|---|
| Germination rate | tests viability and therefore storage |
| Sex ratio | tests the feminisation claim |
| Intersex incidence | tests feminisation quality — and your own environment |
| Vendor and stated breeder | makes the other three attributable |
Also record your canopy temperature and any known light leaks. Without them, a vendor can fairly say a hermaphrodite plant was not the seed’s fault.
To sum up: viability can be fully checked through the germination rate. Feminisation can be checked through sex ratio and intersex incidence, but the local environment muddies the result. Strain identity cannot be checked without genetic testing. Buy on breeder and storage, not on strain name. Buy small from anyone new, and record the four numbers. Where heat and humidity degrade seed all the time, how a vendor stores stock is arguably the most useful thing you can ask about, and almost nobody asks.
5. What this article does not do
It does not list vendors to avoid. Grower reports are not verified findings, and naming businesses on that basis would be unfair. Recorded germination and sex-ratio data across several packs from a named vendor would be a different kind of claim. If you have that data, share it in this discussion.
It does not recommend vendors either. A single grower recommending one vendor in one thread is no basis for a recommendation, and treating it as one would be the same mistake in reverse.
It does not cover seed legality. Importing and selling cannabis seed in Thailand is regulated; see the companion article.
Related reading on seed types, seed-label vocabulary, making feminised seeds, and plant sex and hermaphroditism: forum topics 1273, 1302, 1303, 388, 192, 290 and 267.
This article reports growers’ published accounts and does not name or assess any specific business. Seed rules differ from country to country. Nothing here is legal advice.