Agrochemicals cover pesticides, herbicides, fungicides and biostimulants used in agriculture, horticulture and amenity settings. Products used to protect plants must be authorised by the Health and Safety Executive before sale, storage or use in the UK, which is a central consideration when contract manufacturing in this sector.
Key points
- All plant protection products must be authorised by the HSE before they can be sold, distributed, stored or used in the UK.
- The HSE's Chemicals Regulation Division (CRD) is responsible for pesticide approval; the wider HSE covers biocides and industrial chemicals.
- Post-Brexit, CRD and HSE carried over existing EU pesticide and chemical approvals largely unchanged, and don't currently require separate UK-specific field trials.
- Contract manufacturers in this sector typically handle blending, filling and packing of already-approved active ingredients into finished formulations.
Products Typically Manufactured
Contract manufacturers in this sector produce formulated pesticides, herbicides and fungicides, biostimulants and crop-nutrition products, typically blending and packing active ingredients under a customer's own brand or product registration.
Common Manufacturing Processes
Agrochemical formulation typically involves liquid chemical blending or aqueous blending for liquid products, and powder blending or granulation for solid formulations, followed by filling and packing into approved containers.
Regulatory Considerations
All products for the protection of plants in agriculture, horticulture, forestry, or amenity and home garden use must be authorised by the HSE, with pesticide approval specifically handled by the Chemicals Regulation Division (CRD). Following Brexit, the UK carried over existing EU pesticide and chemical approvals largely unchanged, and CRD does not currently require separate UK-specific field trial data. Product authorisation is generally held by the formulation owner rather than the contract manufacturer, so confirm who is responsible for maintaining approval before entering an agreement.
Why Businesses Use Contract Manufacturing Here
Agrochemical manufacture requires specialised blending equipment and strict regulatory handling, making an experienced contract manufacturer a practical route for businesses that hold or are developing product authorisation but don't operate their own production facility - see contract chemical manufacturing in the UK.
A Separately Regulated Sector
Plant protection products operate under their own authorisation regime, distinct from general chemical regulation. Both the active substance and the formulated product require approval, and authorisation is specific to the product as formulated and to the uses claimed. This is the defining feature of the sector commercially: the regulatory position, not the chemistry, usually determines what is possible and when.
Because authorisation attaches to the specific formulation, changes can require regulatory work rather than only technical validation. Approval timelines are long, so anything requiring it needs planning years rather than months ahead - see UK REACH for the parallel substance registration position.
Manufacturing and Formulation
Agrochemical products come in many formulation types - emulsifiable concentrates, suspension concentrates, water-dispersible granules and others - each with different manufacturing requirements spanning dispersion, milling and granulation.
Actives are frequently hazardous, so handling capability is a genuine filter - see toxic material handling. Demand is strongly seasonal, concentrating production into particular periods, which makes securing capacity ahead of season more important than in steadier sectors.
Questions to Ask a Manufacturer
- What experience do you have manufacturing HSE/CRD-authorised plant protection products?
- Who is responsible for maintaining product authorisation once formulation is transferred to you?
- What container and packaging formats do you support for approved products?
- How do you manage quality control and batch traceability for regulated formulations?
Related Pages
Frequently Asked Questions
Can a contract manufacturer obtain HSE authorisation for our product on our behalf?
This varies by manufacturer and arrangement - some support the authorisation process, but responsibility for holding the approval typically sits with the formulation owner. Confirm this directly before committing to a supplier.
Do UK agrochemical approvals still align with the EU system after Brexit?
Largely yes for now - the UK carried over existing EU approvals and data requirements, and CRD does not currently require separate UK-specific field trials, though the two systems could diverge over time.
Find a Manufacturer
Find a UK Contract Chemical Manufacturer
Search the directory of UK contract and toll manufacturers by process, industry and capability.
Search the DirectoryLast reviewed: August 2026. Regulation and guidance change — verify anything you rely on against the primary source. Tell us if something here is out of date.