How to Choose a Cannabis Dispensary in Koh Samui (2026)

Quick answer: how do you choose a dispensary in Koh Samui?

Check the same core things you would check anywhere in Thailand, then add the island questions. Does the shop hold a license? Is a licensed practitioner available? Can staff explain where products come from and how they were tested? Are products stored properly in the heat and humidity? Are prices posted? What ID is required, and what are the opening hours? Then ask how easy the shop is to reach from where you are staying.

This is a checklist, not a ranking. It works for any shop on the island, including ours in Chaweng.

Key facts

You must be 20 or older, and a shop should check your passport or photo ID.
Since 26 June 2025, a Ministry of Public Health notification limits cannabis sales to medical use. Flower is dispensed against a prescription from a licensed practitioner (the form commonly called PT33), for up to 30 days of supply.
A ministerial regulation published in the Royal Gazette on 30 April 2026 sets extra criteria for new and renewed flower licenses, including a qualifying license (such as a healthcare facility, pharmacy or herbal product license) and DTAM-trained staff on site during opening hours. Licenses issued earlier stay valid until they expire.
Nationwide, 7,131 establishments closed after failing to renew in 2025, according to figures reported on 23 April 2026. Check that any place you found on the internet is still trading.
Siam Green Co has one Koh Samui branch, on Chaweng Beach Road in Chaweng. It operates under a license, and a licensed practitioner is available there.

1. Does the shop hold a license, and can it show you?

Start here. Since 30 April 2026, a new or renewed flower license requires the applicant to hold a qualifying license, such as a healthcare facility, pharmacy or herbal product license. Licenses issued earlier stay valid until they expire. Failing to display a license is itself a suspendable breach under the guidelines reported on 22 June 2026. Ask to see it. You can also search for an outlet on the public map run by the Department of Thai Traditional and Alternative Medicine (the Medical Cannabis Geographic Information System). An entry can carry the company name rather than the shop sign, so zoom in on the street if a trade name finds nothing.

Our guide to the legal rules for cannabis on Koh Samui covers what the law requires in more detail.

2. Is a licensed practitioner available?

Flower needs a prescription, and only a licensed practitioner can issue it. Ask who that is at the shop and whether you can speak to them. A prescription issued in another country is not valid in Thailand, and a shop that says no paperwork is needed is working outside the rule. For the mechanics, see how a Thai prescription is issued.

3. Can staff explain sourcing and testing?

Ask which licensed grower or supplier a product came from and whether there is a lab report (a certificate of analysis) you can read. The useful ones list cannabinoid content and contaminant testing. Staff do not need to be chemists. They do need to answer plainly or say they will check.

4. How is the product stored in tropical weather?

Samui is hot and humid for much of the year, and that is hard on stored flower. Look at how the shop keeps its stock: working air conditioning, closed containers, products kept out of direct sun, and nothing that smells musty. The regulation published on 30 April 2026 also asks licensed premises to store flower separately, off the floor, with an effective odor and smoke removal system. If a shop cannot tell you how it stores its stock, take that as an answer.

5. Do the staff know the products and speak English?

Good staff ask about your situation before they hand you anything, explain the rules in plain English, and are fine saying “I don’t know, let me check.” Test it with one simple question about what a product contains. Beware of anyone who pushes the most expensive item or rushes you.

6. Are the prices clear?

Look for posted pricing and ask whether the price differs by customer. A fair shop quotes visitors the same price as residents and tells you the total up front. We do not quote prices in articles, so check them in the shop or ask when you call.

7. What ID does the shop ask for?

A compliant shop checks ID every time. The minimum age is 20, and sales to anyone under that, or to pregnant or breastfeeding women, are prohibited. Carry your passport or a photo ID. Cannabis smoke and smell are treated as a nuisance under the Public Health Act, and that includes the beach, so a good shop will tell you where you cannot use what you have purchased.

8. Is it described honestly as medical?

Thai rules treat sales as medical use, with a prescription. A shop that sells a holiday or party angle, or promises effects, is not describing the legal position accurately. Look for plain, factual language and no health promises.

9. Where is it, and how do you get there?

If you are staying in Chaweng, Siam Green Co Chaweng is at 200/8 Moo 2, Chaweng Beach Road, Koh Samui 84320, about 190 meters in a straight line from the nearest beach, roughly a three minute walk. Have your hotel or driver pin the Google Maps listing so you arrive at the right door.

10. What are the opening hours?

Treat hours as a plain fact and confirm them on the shop’s Google listing, since they can change. The Chaweng branch is open daily from 11am to 3am.

Frequently asked questions

Which dispensary in Koh Samui is right for me?

The one that passes your checklist and is easy to reach from where you are staying. Check the license, a practitioner on hand, honest answers on testing and storage, and ID checks. We make no claim that any one shop is better than another. If you are staying in Chaweng, the Siam Green Co Chaweng branch is on Chaweng Beach Road.

Do I need a prescription to purchase cannabis on Koh Samui?

Yes. Since 26 June 2025, flower is dispensed against a prescription from a licensed practitioner, for up to 30 days of supply. CBD products under 0.2 percent THC are the exception. A practitioner is available at the Chaweng branch.

What do I need to bring?

Your passport or photo ID. You must be 20 or older. A prescription from another country is not valid in Thailand.

Is a place I saw online still open?

Maybe not. Many shops closed after failing to renew their licenses in 2025. Check the current Google Maps listing and opening hours, or call before you go.

Can I use cannabis on the beach or take it home?

No to both. Cannabis smoke and smell in public are treated as a nuisance, and ignoring an official order to stop can bring up to three months in prison, a fine of up to twenty-five thousand baht, or both. Taking cannabis out of Thailand is an export offense with up to ten years in prison.

Does Siam Green Co have shops outside Koh Samui?

Yes, four in Bangkok. See how to choose a dispensary in Bangkok, or open the Siam Green Co homepage.

Staying near Chaweng? Open the Chaweng listing in Google Maps or call +66 92 484 2330 before you set out.

Last updated 13 November 2026. Thai cannabis rules have changed repeatedly since 2022. This is general information, not legal advice.