There is no universal legal plant count
Spanish law does not provide a general nationwide number of cannabis plants that automatically makes home cultivation lawful. The question cannot be answered by counting plants alone. The purpose and circumstances of the activity matter, together with a separate administrative rule about visibility to the public.
This explains why a claim such as a fixed number is always allowed is misleading. A quantity can be evidence in a case without functioning as a statutory licence. A home address is also a location, not a complete legal classification of what happens there.
Article 368 concerns conduct and purpose
The Criminal Code’s Article 368 includes cultivation, preparation and trafficking, as well as other conduct promoting or facilitating unlawful drug consumption. Its application is therefore concerned with the activity in context, not merely the label personal use attached to it.
Cultivation exclusively for a person’s own consumption has been distinguished from supply-related conduct, but the distinction depends on facts. It does not create an automatic permission for organised distribution, including arrangements described as collective or nonprofit. The absence of a commercial profit motive does not settle all the elements of the legal question.
Public visibility has its own provision
Article 36.18 of Organic Law 4/2015 treats unlawful planting or cultivation in places visible to the public as a serious administrative offence when the conduct is not a criminal offence. The wording establishes a separate category; it does not say that everything outside that category is authorised.
This is an important logical distinction. A rule penalising one circumstance is not a general licence for every other circumstance. Criminal assessment and the public-visibility provision address different aspects of the conduct and should not be collapsed into a single slogan.
An association does not supply a household exemption
Association registration establishes an organisation within the law governing associations. It does not displace the Criminal Code. The fact that people describe an arrangement as shared consumption or maintain membership records does not make its legal assessment identical to an individual’s private conduct.
Likewise, medical need and a regulated medical preparation are different from a general home-cultivation permission. Spain’s medical framework under Royal Decree 903/2025 regulates standardised preparations and magistral formulations through pharmaceutical institutions. It does not establish a household plant allowance. The answer is therefore a set of legal distinctions, not a cultivation method or a number that guarantees immunity.
Sources & further reading
General information, not individual legal or medical advice.