The Plantz Guide to Mary Jane

Heading to Mary Jane Berlin? Whether you’re a patient, a curious visitor, or somewhere in between, Germany’s cannabis laws are worth understanding before you step through the door at Messe Berlin.

Since April 2024, adults in Germany can legally possess up to 25 grams of cannabis in public — and yes, that applies to you regardless of nationality. But “legal to possess” and “easy to access” are two very different things. There are no dispensaries. No shops. No coffeeshop culture like Amsterdam. Cannabis Social Clubs are reserved for residents with at least six months on the books, and THC edibles remain firmly off the table under German food law.

So what can you actually do? Where can you smoke? What happens if you’re stopped? And if you’re a medical cannabis patient travelling with a prescription from the UK or elsewhere, does that protect you in Germany?

We put together a free downloadable guide covering the essentials: possession limits, consumption zones, how to get a German prescription as a visitor, travelling with your medication, driving laws (that 3.5 ng/ml THC limit catches people out), your rights if stopped by police, and whether your foreign prescription actually means anything at the border.

What Powers This Guide

The information in this guide is drawn from the Cannabis Knowledge Base — a structured, evidence-graded knowledge base maintained by the Cannabis Knowledge Foundation and built by the team behind Plantz.

The CKB covers everything from clinical research and product science to regulation across dozens of jurisdictions, and it’s what powers Cannavec.ai — our cannabis intelligence platform built for cultivators, clinicians, researchers, and cannabis businesses across Europe. If you work in the industry and want access to the same knowledge infrastructure that produced this guide, Cannavec is where to start.

Download the Guide

The full guide is available as a presentation you can save to your phone and reference on the go. It covers the seven questions visitors ask most, with clear answers, practical tips, and a travel checklist for medical cannabis patients.

Stay informed. Stay legal. And enjoy Mary Jane.

Have questions we haven’t covered? Drop us a message or visit cannavec.ai to explore the knowledge base directly.