Cairns has a new kind of gold rush, and it smells nothing like the one that upended Victoria 175 years ago. A small business operating out of a leased shed on Aumuller Street in Portsmith is quietly turning organic waste from the city's cafes, restaurants and markets into bagged compost and liquid fertiliser, selling direct to growers across the Atherton Tablelands and to urban gardeners from Bungalow to Yorkeys Knob. The venture — Wet Tropics Soil Co., launched in March 2025 — processed more than 40 tonnes of food-derived organic material in its first 15 months of operation.
The timing is deliberate. Across Australia, hospitality businesses are under growing pressure to divert waste from landfill as state governments tighten organics disposal rules. Queensland's Waste Reduction and Recycling Act has set staged targets for commercial food waste diversion, and Cairns Regional Council has been piloting a food organics and garden organics collection program — commonly called FOGO — across selected suburbs since late 2024. Small operators who can close that loop locally, without the cost of trucking material south, are suddenly very well positioned.
The Cairns Supply Chain Nobody Saw Coming
Wet Tropics Soil Co. sources its raw feedstock from 14 hospitality venues around central Cairns, including businesses on Shields Street and along the Esplanade strip. It also picks up spent coffee grounds from a roaster in the Cairns City industrial precinct and fruit waste from a wholesale produce supplier at the Cairns Produce Markets on Aumuller Street — a convenient proximity to the processing shed next door. The business pays nothing for the feedstock; venues pay a modest collection fee averaging $38 per weekly pickup, which is still cheaper than standard commercial waste removal through council-contracted services.
The finished product moves two ways. Bagged premium compost retails for $14.50 for a 10-litre bag, stocked at Bunnings Cairns on Mulgrave Road since February 2026 and through the Rusty's Markets stall the business runs every Saturday morning. Bulk orders go directly to hobby farms and small-scale growers around Mareeba and Yungaburra, where the rich basalt soils of the Tablelands benefit from the nitrogen-dense tropical fruit waste that makes up a significant share of the mix. Revenue for the 12 months ending June 2026 came in just under $280,000, according to figures the business shared with The Daily Cairns.
It is a lean operation. The founder employs two part-time staff and handles most logistics personally using a refrigerated ute — a second-hand purchase that cost $22,000 and remains the single biggest capital asset in the business. Overheads are low precisely because the model was designed around Cairns' geography: short collection routes, local end-markets, no need for cold-chain storage of the finished product.
What Other Cairns Operators Can Take From This
The broader lesson for Cairns small business is about identifying friction in existing systems. The hospitality sector here generates significant organic waste year-round — the city's tropical climate means produce turnover is fast and off-cuts are constant. Few operators had previously thought of that stream as anything other than a disposal problem. Wet Tropics Soil Co. reframed it as a supply chain.
Cairns Chamber of Commerce has flagged circular-economy business models as a priority area for its 2026-27 small business development programming, with workshops tentatively scheduled at the Cairns Convention Centre precinct from August. The chamber has pointed to the Portsmith venture as a case study it plans to use.
For anyone watching from the sidelines, the practical signals are clear. Queensland's FOGO rollout will expand to more Cairns suburbs by mid-2027, which means more organic material entering the system and more potential feedstock for businesses that can process it. Industrial lease space in Portsmith and the Manunda area remains relatively affordable compared to Brisbane equivalents — sheds in the 300-to-500 square metre range were still listing below $120,000 annually as of the June 2026 quarter. The infrastructure for a low-capital, waste-anchored business model is already here. Wet Tropics Soil Co. just got there first.
