How the War on Iran Is Driving Up Food Prices

The conflict with Iran is sending shockwaves through global food supply chains, and nowhere is that pressure more visible than in the unglamorous but instructive world of commercial mushroom growing. According to Jack Ward, chief executive of the British Growers Association, Britain’s mushroom industry represents a microcosm of the broader food economy, and the inflationary forces now bearing down on it offer an early and unambiguous warning for consumers and investors alike.

“Almost by the day, everything is increasing,” Ward said. “There’s a huge amount of uncertainty and nervousness.” The Institute of Grocery Distribution has already projected that food inflation could exceed 6 per cent this year, a figure that carries significant weight given the organisation’s typically measured forecasting approach. Critically, the Institute has acknowledged that a substantial degree of uncertainty remains baked into even that estimate.

The mechanics of why mushrooms matter to this story are instructive. Commercial mushroom cultivation in Britain is a year-round operation, meaning the inflationary pressures emerging now are not deferred to a future harvest season — they are immediate and visible. Most mushrooms begin life in specialist compost, typically a blend of horse or chicken manure combined with spores, the bulk of which is imported by the thousands of tonnes from Holland and Ireland. Ward notes that haulage and ferry costs are rising sharply, with diesel prices having increased by approximately one third. That is before a single spore has germinated.

Climate-controlled growing sheds represent the second major cost pressure. Electricity is a significant component of mushroom production costs, and energy prices have lurched upward in response to the disruption of oil flows through the Strait of Hormuz. Tim Livesey, of Livesey Brothers Mushrooms, operates as a specialist woodland grower and has the relative advantage of relying on sawdust rather than imported compost. The company is also shielded by an 18-month electricity contract. Nevertheless, Livesey reports that fuel oil, which provides a substantial portion of the company’s heating, has doubled in price. Packaging costs have risen in parallel, given that plastics are derived from oil-based feedstocks. Taken together, Livesey estimates that mushroom retail prices would need to rise by at least 10 per cent even in the absence of any further deterioration in market conditions.</p>

The implications extend well beyond mushrooms. Ward raises a point that deserves serious attention from those monitoring agricultural commodity exposure: the United Kingdom is currently at the peak of its planting season. The crops going into the ground right now will form the backbone of domestic food supply over the next six months. Those crops require tractors that are costlier to run and fertiliser derived from natural gas feedstocks, the price of which has doubled. Farmers are being forced to price in extraordinary uncertainty at precisely the moment when planting decisions carry maximum consequence.

James Walton, chief economist at the Institute of Grocery Distribution, draws a useful parallel and an important distinction. He does not anticipate an inflationary episode as severe as the one triggered by the Ukraine war, but he is clear that the duration of the current conflict is the dominant variable. “Food and drink is quite energy intensive,” he noted. “A good rule of thumb is it takes five calories of fossil fuel to bring one calorie of food onto the plate.” Most food businesses hedge their energy costs to manage short-term volatility, but those hedges have finite horizons. The longer the war persists, the more companies will be forced to renegotiate contracts at materially higher rates, passing costs down the supply chain and ultimately to the consumer.

Walton’s assessment of the range of outcomes is sobering. A swift resolution to the conflict could, in his view, forestall a significant wave of inflationary pressure. The worst-case scenario, however, is not a sharp escalation but rather a protracted and ambiguous conclusion, one in which the transition back to supply chain normality is gradual, unclear, and difficult to price. For food producers, retailers, and the investors who hold positions in them, that ambiguity may prove to be the most damaging outcome of all.