13 min read
Hannah Clark
A common question that circles the cannabis industry and patients prescribed medicinal cannabis products legally often ask is, "Will home-grown in the UK ever be legal?" The answer is, it’s hard to say.
Let's look at the Home Office's reasons for regulating cannabis as it does - as a medicine.
Key takeaways
Contents
No. Growing any amount of cannabis without a Home Office Licence is illegal, regardless of whether you are a medical cannabis patient or not.
The government’s reasoning for this law are:
Regulation: growing your own plants means no regulated concentrations of cannabinoids (like THC and CBD)
Public Safety: growing your own cannabis can have serious safety risks like damaging the structural integrity of your home or increased fire risk from bypassed and overloaded circuits.
Preventing misuse: Growing your own cannabis means no regulation or oversight, making the risk of misuse much higher.
Under UK law, cultivating cannabis is an offence under section 6 of the Misuse of Drugs Act 1971. As a Class B controlled drug, the maximum penalty for possession of cannabis is 5 years in prison, an unlimited fine, or both. Some police forces may issue a warning if you are found in possession of cannabis or a £90 on-the-spot-fine.
The penalties for supply and production (growing your own) are even heavier, with a maximum of up to 14 years in prison, an unlimited fine, or both.
In 2025, a ‘Grow Your Own’ petition asked for a similar arrangement as other countries where patients could grow their own medical cannabis. However, the government said there were “no plans to change this law.”
Growing one plant or many plants, the law remains the same. It is illegal to grow your own cannabis in the UK, and the amount of plants or intent for personal use does not override that. You could still face maximum penalties for the production of cannabis (up to 14 years in prison, an unlimited fine, or both) even if you only grow one plant.
Generally speaking, the Sentencing Council uses a guidance system for the recommended management for cases of drug production (category 1 to 4) by categorising offences depending on the extent of the production (commercial to personal) the drug’s Class (A to C), and the individuals role in the production (from lesser to significant).
Cultivating your own cannabis would likely find you in category 4 (up to 7 plants with an estimated yield of 55g per plant), and you could face from a low-level community order to to 18 months custody depending on the role, with a range from a B and B fine to 3 years.
There are two routes for UK patients to access medical cannabis legally.
The first is through the NHS, but there is one glaring caveat - the NHS is only likely to prescribe medical cannabis products for patients with rare and severe forms of epilepsy, muscle spasticity caused by multiple sclerosis, or for patients undergoing chemotherapy who are struggling with heavy nausea or vomiting.
Which is why many UK medical cannabis patients access their medication through private clinics like Releaf. Specialist doctors at private clinics can prescribe CBPMs for a much broader range of conditions provided you have a diagnosis and have tried two or more conventional treatments without the desired effect.
Medicine is an institution and has a set of guiding principles. Medicines are highly regulated products in the UK following international drug conventions. Due to this fact, there is a difference between medicinal cannabis and using cannabis medicinally.
Medicinal cannabis is cannabis flowers grown for medicinal purposes and is a specific Cannabis Based Medicinal Product in its rawest form. How cannabis is grown and manufactured into an end product defines it as a medicine. The cultivation facility is regulated to specific standards to grow licensed cannabis. A manufacturing licence holder will carry out the trimming of cannabis flowers. It is prescribed by a specialist doctor and dispensed by a pharmacist through a chemist. All of these stages are subject to government inspections. It can only be possessed with a prescription.
People who claim to use cannabis medicinally may not be using medicinal cannabis prescribed by a doctor, but they are using cannabis from another source to treat a medical condition or a set of symptoms. This kind of use is also referred to as therapeutic rather than medical by qualified medical practitioners due to the lack of professional oversight and absence of regulation during the cannabis production stages.
Cannabis not produced under regulated and licensed conditions cannot have the same quality and efficacy assurances as medicinal cannabis. Cannabis bought from the illicit market may have hidden risks, such as contamination with chemical pesticides and mould, which could be dangerous to someone with a compromised immune system.
In the UK, patients are not permitted to grow their own medicine at home. The law does not allow patients to buy or possess cannabis grown by anyone anywhere else.
Cannabis can only be legally cultivated in the UK with a special Home Office licence.
To achieve accredited Good Manufacturing Practice (GMP) status in the UK, cultivation facilities must show they can produce crops consistently.
The exact regulations and applications process for these licences vary on whether you are growing medical cannabis or hemp, but it is still a lengthy and expensive process either way.
There are three main reasons the government gives as to why home cultivation is prohibited in the UK, even for medical cannabis patients, which we mentioned earlier. Now we’re going to look in a little more detail at each.
In the UK, all medical cannabis products must be prescribed by a specialist doctor and dispensed through a registered pharmacy. This strict regulation ensures that patients are receiving tested and standardised products.
The level of regulatory oversight that all medical cannabis grown in the UK must go through is simply not possible for home cultivation. As a result, the government has chosen to prohibit it entirely to maintain quality control, safety, and accountability.
All cannabis grown for medical purposes in the UK (or imported) is subject to strict testing and quality control measures to ensure the medications have consistent levels of cannabinoids and terpenes, the two main groups of therapeutically active compounds.
Keep in mind that cannabis, like any plant, can have genetic variations and inconsistent potency, especially when grown in unregulated environments. It’s also vulnerable to pests and mould, which is why all UK medical cannabis undergoes strict testing to ensure it meets the highest safety and quality standards.
One of the issues with allowing home cannabis cultivation is the potential for misuse. Without proper oversight and regulation, there is a risk that cannabis grown for personal medical use could end up on the black market.
Canada: Canada legalised medical cannabis in 2001 and under the Cannabis Act, a maximum of 4 plants are allowed per household for personal use. Growing cannabis for medicinal use in Canada is subject to obtaining a registration certificate from Health Canada, and for growers to comply with relevant regulation regarding production limits and maximum plant possession limits.
Germany: Germany legalised medicinal cannabis in 2017 and allows patients with certain medical conditions to access CBPM with a prescription through pharmacies. Since 2024, adults who have lived in Germany for at least six months can grow up to 3 cannabis plants for personal consumption.
Thailand: Thailand legalised medicinal cannabis in 2018 and launched the policy by giving away one million free medicinal cannabis plants. However, laws have shifted back towards medicinal use, so it’s important to check before travelling.
Australia: Australia legalised medical cannabis at the federal level in 2016, allowing licensed companies to grow and produce CBPM for prescription and export. Each state and territory has its regulations.
Spain: Spain has no official medical cannabis cultivation policy, and so Spanish law does not explicitly authorize personal cultivation with a specific plant limit. However, while growing your own cannabis in Spain is not a crime if it’s done in a private place hidden to the public, it may be investigated if you are believed to be supplying cannabis for others to use.
Netherlands: It is against the law for individuals to grow cannabis in the Netherlands. Having five or less plants typically results in seizure of the plants and the grower isn’t prosecuted, but any more and the Public Prosecution Service will prosecute.
Uruguay: Uruguay was the first country to legalise cannabis nationally in 2013. Registered adults can grow up to 6 plants at home. Those who do not want to or can not grow their own plants can opt for access through a pharmacy which limits them to 40g per month (10g per week). The same allowance applies to registered members of cannabis social clubs, which are regulated groups (between 15 and 45 individuals) who can grow up to 99 plants collectively.
The United States: Cannabis legality varies across states in the US, with each having their own legislation and policy regarding cannabis use and cultivation. There are plant limits in place which also vary by state, with California allowing up to six plants per household (or more for medical patients with a doctor's recommendation) whereas households in Michigan can have up to 12 plants.
Laws regarding the use and cultivation of cannabis vary greatly by country, and the Cannabis Industry Council’s (CIC) map shows where in the world cannabis prescriptions are legal, and where adult use is either decriminalised or illegal. Remember, cannabis being decriminalised is not quite the same as it being legal, and you should always research a country’s cannabis laws before travelling as some only extend to citizens and not tourists.
No, The government does not permit you to grow medical cannabis in the UK legally. Only companies with a Home Office licence can cultivate cannabis for specific purposes.
To legally grow medical cannabis for patients prescribed in the UK you must have a licence from the UK Home Office.
You can apply for a licence to cultivate cannabis for medical purposes legally in the UK. There are costs involved, and the application process is stringent.
Patients cannot legally grow CBD plants as hemp is still cannabis, and you need a licence to grow hemp too. You must have land to grow hemp away from public footpaths and have good security. The end product can only be used for seeds and fibre, processing hemp for CBD isn’t possible legally in the UK without a further manufacturing licence.
Due to the different laws countries have for medical cannabis, it is very important to know what they are before you travel. Regulations vary, so what may be permissible in one country may be against the law in another. Releaf has a helpful and dedicated travel section in our Education suite to help guide you to more appropriate information sources.
If you are leaving the UK for greener grass and want to know if you can grow your own medical cannabis because you have seen it is legal, you should apply through the system provided. Always follow all local and national laws and bylaws surrounding the medical cannabis cultivation process.
Sadly for home growers, testing facilities aren’t as accessible as many would like access. In some states, there are labs that patients can access, but the costs are high. They offer facilities to show cannabinoids, terpene, heavy metals, pesticides and other contamination levels. Medical cannabis policy around the world is still in its infancy, and there is still time.
There are differences between growing cannabis at home and an indoor medical cannabis grow facility. From the scale to the level of regulation that happens at each stage, a legal cannabis growing facility is essentially a cannabis factory dedicated to the production of cannabinoids. The goal of medical cannabis facilities is to produce a standardised product that matches lab results within an acceptable range for each crop. Home-grown cannabis is done in a smaller space or even outdoors, and unless the cultivator is taking the same level of precautions to monitor air, light and feed quality to a standardised operating procedure, results may vary from crop to crop.
No. Cannabis cultivation in the UK is only legal for those with a Home Office licence, regardless of how many plants or their intended use.
Yes. Cannabis plants are a Class B controlled drug making it illegal to produce (grow) in the UK. Only those with a Home Office licence can grow cannabis, and even then with rules and restrictions.
Yes, so long as you are using it as advised by your prescribing specialist. Smoking cannabis is illegal regardless of if it is prescribed, which is why patients prescribed medical cannabis flower are instructed to use a vaporiser.
Releaf understands the importance of medical cannabis in treating various medical conditions. With our tailored monthly packages, specialist consultations for medical cannabis, and a medical cannabis card for peace of mind, you can access the treatment you need without worrying about the stigma.
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