Last reviewed Oct 7, 2026Suggest an edit

Siam Green Cannabis Co

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Bangkok Dispensary

5 locations

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About Siam Green Cannabis Co

Five-branch medical cannabis dispensary chain in Bangkok (Phrom Phong, Nana, Chinatown, Silom) and Chaweng, Koh Samui, with in-branch PT33 consultations.

Siam Green Cannabis Co runs four dispensaries in Bangkok — Phrom Phong next to EmQuartier, Nana between Sukhumvit Soi 10 and 12, Chinatown on Maha Chai Road and Silom by BTS Sala Daeng — plus a fifth on Chaweng Beach Road in Koh Samui, opposite Central Festival.

The company is explicit about the rules: a customer needs a PT33 prescription, issued by a licensed practitioner after a consultation in the branch, and each prescription covers up to 30 days' supply. Bring a passport or Thai ID; the minimum age is 20. Branches keep flower in humidity-controlled storage and several have seating that the company markets as coworking space.

Siam Green's pitch is education over hard selling, and reviews of the Nana shop on WEED.TH largely bear that out: people mention staff who explain strains carefully and a clean, calm room. Not every reviewer is happy. One said he was charged 300 baht for a 'medical licence' he felt he did not need — in practice this is likely the consultation fee, so ask what it covers before paying. Another found prices on the high side but the quality worth it.

Siam Green says its five branches together hold a 5.0 Google rating across more than 7,000 reviews. Opening hours differ by branch and are not posted on the main site; a directory lists the Chaweng shop as open 11 a.m. to 3 a.m.

What’s good

Four Bangkok branches plus Chaweng, Koh Samui
PT33 consultation inside each branch
Staff praised for explaining strains
Humidity-controlled flower storage

Worth knowing

Consultation fee (about 300 baht per one reviewer) not published
Branch hours not listed on the main site
Licence numbers not published

Products

Flower
Edibles

Services

In-store shopping
Medical patients
Prescription required
Consumption lounge

Six signals

Score breakdown

2 of 6 criteria assessed · 35% of the weight

License & compliance25% of scoreNot assessedActive license on the official register, clean enforcement history
Customer reviews25% of score9.9 out of 10Verified on-site reviews; otherwise large public rating samples
Lab & product transparency20% of scoreNot assessedPublished lab results, clear pricing, ownership and contacts
Pricing & value10% of scoreNot assessedPrices against the local median for the same category
Service & access10% of score8.2 out of 10Hours, ordering, delivery, accessibility, ID checks
Complaint handling10% of scoreNot assessedHow often and how well problems are answered in public

Initial score based on 1,363 public ratings, listed services and hours. Lab transparency, pricing and complaint handling have not been assessed yet.

Not enough data yet. We publish an overall score once criteria worth at least 45% of the weight can be checked. Empty criteria are never guessed — they are left out and the rest are re-weighted.

How we score sellers

Reviews

Reviews of Siam Green Cannabis Co

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Ratings on other platforms

Public star ratings as shown on each platform when we checked. They are not part of Verdex reviews.

WEED.TH 5/51,363 reviews · checked Sep 2026

What reviewers say elsewhere

Fees
One reviewer at the Nana branch objected to paying 300 baht for a 'medical licence' he considered unnecessary.
Source: WEED.TH reviews, May 2026 · summarized by Verdex editors
Staff and location
Visitors call the Nana shop convenient and the staff helpful, with reasonable prices on edibles.
Source: WEED.TH reviews, May 2026 · summarized by Verdex editors
Prices
A reviewer found prices higher than elsewhere but said the focus on quality justified them.
Source: WEED.TH reviews, Apr 2026 · summarized by Verdex editors
Selection
Reviewers single out a strong strain selection and budtenders who explain effects in detail.
Source: WEED.TH reviews, Apr 2026 · summarized by Verdex editors

These are our editors’ summaries of what customers wrote about Siam Green Cannabis Co on other platforms — not verbatim quotes and not reviews collected by Verdex.

Locations

5 locations, one profile

Phrom PhongMain location
Next to EmQuartier, BTS Phrom Phong, Bangkok
Directions
Nana
Sukhumvit Road between Soi 10 and Soi 12, near BTS Nana, Bangkok
Directions
Chinatown
325 Maha Chai Road, 10200, Bangkok
Directions
Silom
Near BTS Sala Daeng, two minutes from Patpong, Bangkok
Directions
Chaweng (Koh Samui)
200/8 Chaweng Beach Road, Bo Phut, Ko Samui, 84320, Koh Samui
Opening hours
Opening hours — Chaweng (Koh Samui)
Monday 11 am – 3 am
Tuesday 11 am – 3 am
Wednesday 11 am – 3 am
Thursday 11 am – 3 am
Friday 11 am – 3 am
Saturday 11 am – 3 am
Sunday 11 am – 3 am
Directions

Opening hours — Chaweng (Koh Samui)
Monday	11 am – 3 am
Tuesday	11 am – 3 am
Wednesday	11 am – 3 am
Thursday	11 am – 3 am
Friday	11 am – 3 am
Saturday	11 am – 3 am
Sunday	11 am – 3 am

Questions & answers

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