Hawai'i does not recognise plant biostimulants as a product category.

Instead, the state regulates these products according to what they contain and what they claim, which means a single formulation can fall to two or three different legislative frameworks of the Hawai'i Department of Agriculture at the same time. Products containing microorganisms are handled by the Plant Quarantine Branch under Chapter 4-71A of the Hawai'i Administrative Rules. Any claim touching on pest control, however it is worded, routes the product to the Pesticides Branch. And every packaged product sold in the state must satisfy the packaging and labelling rules enforced by the Measurement Standards Branch.

For microbial biostimulants, everything turns on four lists of microorganisms promulgated under Chapter 4-71A: Nonrestricted, Restricted Part A, Restricted Part B, and Select Human Pathogens. Organisms that appear on none of them are treated as unlisted.

Only a product in which every microorganism is a natural strain on the Nonrestricted List can be registered as a microbial product, and only that registration confers the right to sell and distribute in Hawai'i. It costs USD 150, is valid for one year, and requires a specimen label, an abstract of the organisms covering their origin and any genetic modification, and the identification of an importer in Hawai'i. Any product falling outside that route, because it contains a restricted, unlisted or genetically modified organism, can still enter Hawai'i, but only under a permit issued case by case to the end user of the product. In commercial terms that is not a market access route at all: the permit belongs to the grower, not the supplier, and it must be obtained again for each customer.

This makes list screening the decisive early step, and the results are often counter-intuitive. The entire Bacillus genus, with a single exception, sits on the Nonrestricted List, as do Penicillium, Saccharomyces, Streptomyces, Azotobacter, Rhizobium and the principal microalgal genera. But Trichoderma is nonrestricted for only three species, so two of the most widely commercialised strains are restricted. Eight Glomus species are nonrestricted while the rest of the genus is not. Azospirillum, one of the most common bacterial biostimulants worldwide, appears on no list whatsoever.

A further complication is that the lists were fixed in 2001 and have never been retaxonomised. Strains that carry a modern accepted name will frequently be found on the lists only under an older synonym, and several nonrestricted mycorrhizal entries fall into exactly this trap. Declaring a strain under its current name alone can result in it being treated as unlisted, with the delay and loss of distribution rights that follow. The practical answer is to declare both names and to secure the authority's written agreement on the equivalence before filing.

Non-microbial biostimulants, including seaweed extracts, humic and fulvic substances, protein hydrolysates and inorganic biostimulants, sit outside this framework and face a considerably lighter path, although the precise extent of any fertiliser-specific requirements should be confirmed for each product.

In all cases the label itself must carry compliant declarations of identity, quantity and responsibility, and the state offers a free pre-review of proposed labels before printing, which is worth using. Products containing microorganisms are subject to additional obligations on entry: shipments must arrive through the port of Honolulu, be marked and documented in a prescribed way, and be presented for inspection, with any resulting costs falling to the importer.

None of the published guidance states processing times, and the existence of a paid expedited procedure suggests standard timelines should not be assumed to be short. Where a lead strain is restricted or unlisted, the realistic options are reformulation towards a nonrestricted equivalent, which the breadth of the Nonrestricted List often makes feasible, or a formal petition to have the organism reviewed and listed, which is a slower and considerably more expensive undertaking.

Basis: Hawai'i Department of Agriculture & Biosecurity (HDOA/DAB) documents – HAR Chapter 4-71A microorganism lists (§4-71A-21 to -24, version of 25 October 2001), Form PQ-7, Form PQ-MP (Rev. 08/11), Microorganisms Guidelines, Plant Quarantine Application for Permits (incl. fee schedule), Measurement Standards Branch General Labeling Guidelines (update 20240711), HDOA FAQ.

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The sciBASICS Team.