Residential use
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What the condition says
The labeling either directly recommends residential use or reasonably can be interpreted to permit it.
Direct recommendation is the easy half
If the directions name a lawn, a garden bed, a houseplant or a patio, the product recommends residential use and the question is answered.
Reasonable interpretation is the hard half
A product whose directions are agricultural but whose pack size, price and retail channel are all consumer is open to the reading that it permits residential use.
Pack size speaks loudly here
A 500 mL bottle of concentrate is not an agricultural pack. Size is part of the presentation, and it is one of the clearest signals about who the product is for.
So is where it is sold
A garden centre shelf alongside consumer products is a context the label is read in. The regulation is about what the labeling can reasonably be interpreted to permit, and context informs interpretation.
Decide it, then be consistent
Pick the market, then make the directions, the pack size, the channel and the marketing agree. Inconsistency is what creates the reasonable interpretation you did not intend.
And document the reasoning
Whichever way it goes, write down why, with the date and the toxicity numbers it rests on. A reformulation or a new pack size puts the question back on the table and nobody will remember the first answer.
A professional product can still be bought by anyone
Unless it is restricted use, there is no gate at the till. That is precisely why the test is about what the labeling can reasonably be interpreted to permit rather than about who you intended to sell to.
The cheapest route is usually to comply
A child resistant closure costs a little more per unit and settles the question. Building a case that a consumer-sized bottle sold through a garden centre is not for residential use costs more than the closures ever will.