GACP Certification for Cannabis Growers

Planning to sell medical cannabis into Europe, and unsure what “GACP” actually asks of your grow?

If you cultivate cannabis for the medical market, GACP certification is one of the first quality hurdles you will meet, and one of the most misunderstood. GACP, short for Good Agricultural and Collection Practices, is a set of guidelines that assure the quality of medicinal plant starting materials (WHO, 2003). This guide explains what GACP conformance really means for a cannabis grower, how it differs from GMP and Canada’s GPP, and where the documentation burden lands.

The short version: GACP is not a single certificate that a regulator stamps and hands you. It is a guideline you demonstrate conformance to, usually through an audit by the downstream GMP manufacturer, a competent authority, or a third-party certification body. Understanding that distinction protects you from over-promising to buyers and helps you build the records that a real audit will demand.

What is GACP certification for cannabis growers?

GACP certification is proof that your cultivation, harvesting, and primary processing meet the Good Agricultural and Collection Practices guidelines for medicinal plant starting materials. For cannabis, that means the flower you grow qualifies as an acceptable raw material for a medicine, before any GMP manufacturing begins.

The guideline originates with the World Health Organization, which published its WHO guidelines on good agricultural and collection practices (GACP) for medicinal plants in Geneva in 2003 (WHO, 2003). WHO’s stated objectives are to contribute to the quality assurance of medicinal plant materials, to guide national and regional GACP guidelines, and to support sustainable cultivation and collection. In other words, WHO wrote GACP as guidance for countries to adopt, not as a certificate to issue.

In the European Union, GACP is defined by the European Medicines Agency’s Committee on Herbal Medicinal Products (HMPC) in its Guideline on Good Agricultural and Collection Practice (GACP) for starting materials of herbal origin, reference EMA/HMPC/246816/2005 (EMA/HMPC guideline). The original guideline came into effect on 1 August 2006, and Revision 1, which updates it for developments including indoor growing technologies, is now the current version, effective 12 August 2025 (EMA/HMPC guideline). Cannabis grown for medical use is treated as a herbal starting material, which is why GACP applies to it.

So when the industry says “GACP certification,” it usually means a documented, audited attestation that a grower conforms to these guidelines, requested by the customer (the GMP manufacturer or importer) who buys the starting material. There is no EMA-issued or WHO-issued GACP certificate the way EU-GMP works through a formal regulator-issued certificate.

GACP vs GMP vs GPP: what is the difference?

GACP governs the raw plant before it becomes a medicine, GMP governs manufacturing the medicine, and GPP is Canada’s own mandatory production standard, which is not the same as GACP. Mixing these up is the most common compliance error growers make.

The table below sets them side by side.

The key relationship to remember: GACP feeds into EU-GMP. A grower producing medical cannabis flower for EU export typically needs GACP-compliant cultivation so the material qualifies as acceptable starting material for an EU-GMP-certified manufacturer or importer. For a full breakdown of how these three regimes interlock, see our overview of EU GMP, GACP and GPP compliance.

How GACP feeds into EU-GMP for medical cannabis export

GACP is the upstream gate and EU-GMP is the downstream gate; the same material passes through both on its way to becoming a European medicine. The EMA guideline is explicit about the handoff.

According to the guideline, the GACP considerations “should be read in connection with EudraLex Volume 4 GMP guidelines Part II for APIs and Annex 7 Manufacture of Herbal Medicinal Products,” and which regime applies “depend[s] on the application of the finished medicinal product. In general, the closer the preparation is to the final product, the stricter the requirements are” (EMA/HMPC/246816/2005). Practically, your cultivation, harvest, and drying sit under GACP, while extraction and formulation into a finished medicine sit under GMP.

This is why an EU importer will ask for GACP documentation from the grower and EU-GMP certification from the manufacturer. As a cultivator, you are rarely the one holding the EU-GMP certificate; you are the one whose GACP records let the GMP site accept your flower without a quality gap.

The GACP process step by step for a cannabis grower

Meeting GACP means putting controls and records in place across the whole cultivation lifecycle, from seed selection to storage. The EU guideline organizes its requirements into clear sections, and they map neatly onto a grower’s operation.

The requirement areas in EMA/HMPC/246816/2005 include: Quality Management; Personnel and Training; Building and Facilities; Equipment; Documentation; Seeds and Propagation Material; Cultivation; Collection; Harvesting; Primary Processing; Packaging; and Storage and Distribution (EMA/HMPC guideline). For a cannabis grower, that translates into a practical checklist:

• Site and facilities: controlled, clean growing environments with documented environmental controls, which matters especially for indoor cultivation.
• Personnel and training: defined roles and training records for everyone handling the crop.
• Seeds and propagation material: verified, traceable genetics and starting stock.
• Cultivation controls: recorded inputs such as fertilisers and pest-control agents, with SOPs governing their use.
• Harvest, drying, and primary processing: logged conditions and steps so each batch’s history is reconstructable.
• Documentation and quality management: SOPs, batch and lot records, deviation and CAPA handling, all kept audit-ready.

A GACP audit is, in large part, an audit of records. If you cannot show what went into a batch, who handled it, and how it was processed, you cannot demonstrate conformance, no matter how good the plants are.

Which countries require GACP for imported medical cannabis?

GACP is expected wherever medical cannabis is sold as a herbal medicinal product under an EU-GMP framework, most prominently across the European Union. But the picture varies by country, and the terminology does too.

• European Union (including Germany): Medical cannabis sold as a herbal medicinal product must originate from GACP-compliant cultivation and be handled under EU-GMP downstream. EU-GMP manufacturers and importers require GACP-conformant starting material, a requirement expressed through EMA/HMPC/246816/2005 and EudraLex Vol. 4. Germany, the largest EU medical market, is where most GACP plus EU-GMP documentation gets scrutinized.
• Australia: Medicinal cannabis must be manufactured under GMP (the Australian Code, aligned to PIC/S), and cultivation is licensed under the Narcotic Drugs Act 1967, administered by the Office of Drug Control (TGA). GACP is widely adopted in practice as the cultivation quality baseline, but Australia’s mandated legal instruments are GMP and the cultivation licence, not a formally issued GACP certificate.
• Canada: Canada does not use GACP. It regulates cannabis quality under Good Production Practices (GPP) in Part 5 of the Cannabis Regulations (SOR/2018-144); the term GACP does not appear in those regulations (Cannabis Regulations). Canadian licensed producers exporting to the EU must meet GACP plus EU-GMP on top of their domestic GPP. If Canada is your base, our guide to GPP requirements for licensed producers covers the home-market baseline.

Documentation and traceability: where a seed-to-sale platform fits

GACP conformance is documentation-heavy, so the practical question is not just “are we compliant?” but “can we prove it on demand?” That is exactly where a seed-to-sale and quality management platform earns its place.

The EMA guideline dedicates whole sections to Quality Management and Documentation and requires records across seeds and propagation, cultivation, harvest, and primary processing (EMA/HMPC guideline). GrowerIQ serves cultivators and processors, and the honest role it plays is as the system of record where growers keep batch and lot traceability, SOPs, personnel training logs, cultivation-input records, environmental data for indoor grows, harvest and drying logs, and deviation and CAPA handling.

That turns GACP from a binder exercise into live, defensible data. When a downstream EU-GMP manufacturer’s Qualified Person audits your starting material, or a third-party certification body reviews your operation, the difference between passing smoothly and scrambling is usually whether your records are complete, consistent, and retrievable. A platform does not issue GACP certification or guarantee a pass, but it does make you audit-ready.

Frequently Asked Questions

Last updated: August 2026

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