Sourcing button mushroom spawn from China

Button mushroom spawn duty and import controls

Read from the UK Trade Tariff on 29 September 2026, heading 0602 covers other live plants, cuttings and slips, and mushroom spawn. Button mushroom spawn falls within the mushroom-spawn line, 0602 90 10 00. The table shows purchasing variants sharing that code, rather than separate tariff subdivisions. For the wider heading, see our oyster mushroom spawn guide.

The supplied tariff record gives 0% duty for mushroom spawn from China, with no anti-dumping or countervailing measure and no suspension recorded. It attaches veterinary control. Confirm its application to the actual spawn and carrier with your customs broker before shipment; this record does not establish that every grain-spawn order needs veterinary documentation.

The tariff also attaches import control of organic products. For spawn described as organic, confirm the applicable inspection certificate and import requirements with your customs broker and an approved UK organic control body. Official guidance directs product eligibility questions to that body. Confirm the commodity code using the species, carrier ingredients and condition supplied.

Specify the button mushroom strain and carrier

Specify Agaricus bisporus, the supplier’s strain identifier, white or brown mushroom type, intended compost system, carrier grain and every additive. Ask explicitly whether the carrier contains manure or other animal-derived ingredients. Agree pack weight, closure and filter design, production and inoculation records, storage conditions and an arrival acceptance procedure.

Ask for batch-linked contamination results and a growth trial using your intended compost. Agree how samples will be selected and how weak or contaminated batches will be handled. Check the producer’s culture handling and packing arrangements through factory verification.

If your broker confirms that processed-manure import rules apply, APHA guidance requires production in an establishment approved to export to Great Britain and the appropriate health certificate. Ask APHA to confirm the proposed Chinese origin, establishment and processing route before committing to that carrier.

Worked duty example

Illustrative example, not a quote: Illustrative order: 2,000 bags of button mushroom grain spawn under 0602 90 10 00, invoiced at £6,000 free on board, with £900 of freight and insurance to the UK. The customs value is £6,900. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £6,900, so it is £1,380. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity: check species, strain identifier, carrier declaration and batch labels against the approved order.

Condition: check mycelial coverage, discoloured patches, wet grain, excess liquid and damaged or leaking packs.

Transport: compare the temperature record with the supplier’s agreed transport conditions and check remaining usable life.

Performance: retain batch-linked samples and run the agreed growth trial before releasing the batch for routine use. Plan this through our quality inspection guide.

What goes wrong

A bag can look colonised while its spawn performs poorly in the buyer’s compost. Strain substitutions, uneven grain colonisation, damaged filters and unsuitable transport conditions can lead to weak growth or contamination. Compare arrival samples with the approved strain and trial method rather than relying on photographs.

A carrier substitution can also change the border questions. Obtain the full ingredient declaration before booking freight, especially where manure or organic claims are involved. Keep suspect batches separate while the supplier and broker resolve the evidence.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.