England’s drought deepens as potato growers confront mounting yield and quality risks

By Lukie Pieterse, Editor/Publisher of Potato News Today

Record drought and dwindling irrigation supplies threaten potato yields, tuber quality and market availability across England.

England’s rapidly intensifying drought is placing the 2026 potato crop under serious pressure at one of its most water-sensitive stages. The immediate concern is not necessarily a complete crop failure, but a widening gap between irrigated and unirrigated fields, reduced tuber bulking, smaller potatoes, higher dry matter and mounting difficulty meeting demanding fresh-market and processing specifications.

As of August 10, approximately 71% of England had officially entered drought, affecting an estimated 45 million people. Four additional Environment Agency regions — East Midlands, Lincolnshire and Northamptonshire, Kent and East Sussex, and Solent and South Downs — were added to the drought list. No part of England was classified as being under normal water conditions: the remaining regions were experiencing prolonged dry weather, the stage immediately below drought.

The deterioration has been unusually rapid, prompting authorities to describe it as a flash drought. England and Wales experienced their driest July in roughly 190 years, while parts of southeast England reportedly received only 1% of their normal July rainfall. Reservoir storage, river flows, groundwater levels and soil moisture have all continued to decline.

Potato crops caught during critical bulking period

For potatoes, the timing is particularly damaging. Much of the English maincrop was still bulking when drought conditions accelerated during July and early August.

Potatoes have relatively shallow root systems and require a consistent supply of moisture. Industry estimates indicate that a commercial potato crop may need approximately 350 millimetres of water during its growing season, supplied through rainfall, stored soil moisture and irrigation.

Water deficits during tuber initiation and bulking can result in:

Reduced total yield
Smaller average tuber size
A greater proportion of undersized potatoes
Uneven tuber development
Growth cracks, misshapen tubers and other quality defects if heavy rain or irrigation follows a prolonged dry interval
Increased dry matter concentration
Greater susceptibility to bruising and handling damage
Difficulty meeting fresh-market, seed and processing specifications

GB Potatoes chief executive Scott Walker has warned that water is a fundamental production input rather than an optional addition. The organisation argues that inconsistent irrigation reduces yield, limits tuber size and produces fewer marketable potatoes.

Irrigation is helping—but access to water is becoming decisive

Farmers Weekly reported that Lincolnshire grower Andrew Godfrey irrigates approximately 30% of his potato area and believes irrigation has provided a clear benefit this season. The larger issue, he said, is whether water remains available.

Godfrey suggested that the drought could raise crop dry matter, making potatoes more difficult to handle. He also urged supply-chain buyers to consider whether existing specifications need adjustment to help make the available crop last.

This is an important distinction. A potato crop can survive dry weather and still become commercially problematic. Potatoes that fall outside contract specifications because of size, shape, bruising or dry matter may be discounted or rejected, even though they remain usable.

Godfrey’s early assessment was cautious rather than catastrophic: he did not expect a good season but said it was too early to conclude that it would be terrible. That remains the most responsible interpretation nationally. There is not yet a reliable final estimate of English potato yield or production, and conditions differ substantially among farms, regions, soil types, varieties and irrigation systems.

More than 1,500 abstraction restrictions reported

The Environment Agency reported more than 1,500 abstraction restrictions during the week ending August 6. Formal restrictions were being prepared in parts of East Anglia to protect exceptionally low river flows.

These restrictions matter greatly to potato production. Some farms possess irrigation equipment but depend on licences permitting them to abstract water from rivers, boreholes or other sources. As flows fall below licence thresholds, growers can be required to reduce or stop abstraction.

The Environment Agency says short-term flexibility may sometimes be considered, but only where environmental standards and the rights of other lawful water users are protected. That means flexibility cannot be assumed—and by the time permission is secured, a crop may already have undergone damaging moisture stress.

Even major reservoirs are being depleted

The severity of the irrigation challenge was illustrated at the Elveden Estate in Suffolk, where a multimillion-pound reservoir was reportedly nearing depletion after being used to support potatoes, onions and carrots. Boreholes and a second reservoir were also under pressure.

This underlines an uncomfortable reality: on-farm reservoirs greatly improve resilience, but prolonged heat combined with exceptionally low rainfall can overwhelm even relatively sophisticated water-storage systems. Water is also being demanded by several high-value crops simultaneously, creating difficult choices about which fields receive the remaining supply.

Market prices are beginning to respond

The Guardian reported that UK wholesale potato prices had risen by more than 40% amid reduced domestic vegetable availability. However, this figure should be treated carefully.

It does not necessarily indicate that all potato prices, contracts or retail prices have increased by that amount. The potato market is highly segmented: early potatoes, maincrop, fresh packing, chipping, processing and contracted supplies can behave differently. Wholesale spot prices can also move sharply when immediate availability becomes tight.

The broader signal is nevertheless important. Buyers are becoming concerned about maincrop availability, while retailers and foodservice suppliers are increasing imports of some vegetables. If potato yields and pack-out rates decline substantially, upward pressure could persist, especially in the free-buy market. Contracted growers, meanwhile, may not receive the full benefit of higher open-market prices if they struggle to deliver the required tonnage or quality. The Guardian

Fresh and processing sectors face different risks

The impact will not be uniform across the potato supply chain.

Fresh-market potatoes may face shortages of preferred pack sizes and higher rejection rates where tubers are small, misshapen or cosmetically imperfect. Retailers may need to relax appearance and size specifications to prevent usable potatoes from being excluded.

Processing potatoes require suitable dry matter, fry colour, tuber size and internal quality. Moderately higher dry matter can sometimes be useful for processing, but excessive dry matter increases susceptibility to bruising and may complicate handling. Reduced tuber size can also lower recovery rates for chips and French fries.

Seed potatoes can face different effects. Smaller tubers are not automatically undesirable in seed production, but drought may reduce overall multiplication, influence physiological condition and complicate crop management.

Unirrigated crops are likely to face the greatest yield risk, particularly on lighter soils with limited water-holding capacity. Crops on heavier soils or fields with greater residual moisture may perform better, although prolonged heat eventually erodes that protection.

Harvest and storage could bring a second wave of problems

The consequences may continue after crops stop growing. Hard, dry soils can make lifting more difficult and increase the risk of mechanical damage. Tubers with elevated dry matter are generally more susceptible to bruising, while harvesting during very warm conditions can complicate cooling and storage management.

If substantial rainfall arrives before harvest, growers may face a different set of difficulties. Rapid rewetting can trigger renewed growth, growth cracks or secondary growth in stressed crops. Heavy rain falling on extremely dry soils may also run off rather than infiltrate effectively.

Storage managers may therefore receive a highly variable crop requiring careful grading, wound healing, temperature management and ventilation. The condition of potatoes entering store—not merely harvested tonnage—will determine how much marketable supply remains available through winter and spring.

Calls grow for a new water-security strategy

The drought is strengthening calls for agricultural water to be treated as part of national food-security infrastructure. Growers and industry bodies want:

Faster and more consistent planning approval for on-farm reservoirs
Greater ability to capture surplus winter water
More flexible and predictable abstraction regulation
Investment in water transfers and regional water-sharing arrangements
Improved irrigation scheduling and application efficiency
Greater recognition of food production when water resources are allocated
Crop varieties and production systems better adapted to heat and intermittent water supply

The government has indicated that it intends to ease some rules governing the development of farm reservoirs. The significance lies in when farmers can obtain water: England may still receive substantial annual rainfall, but increasingly much of it arrives outside the crop’s period of greatest need. Capturing winter rainfall for summer irrigation is consequently becoming central to maintaining domestic potato production.

Bottom line

The evidence supports a serious but measured conclusion. England’s potato crop is under substantial drought pressure, with yield, tuber size, quality and storability all at risk. Irrigated crops are generally better positioned, but irrigation is becoming constrained by depleted reservoirs, low river flows and abstraction restrictions.

There is not yet sufficient evidence to declare a national potato crop disaster or attach a defensible percentage to likely production losses. The greatest certainty is that results will be highly uneven. Farms with secure stored water may produce reasonable crops; nearby farms without adequate irrigation could experience sharply lower marketable yields.

The next several weeks will determine whether England experiences a manageable reduction in supply or a more consequential shortage extending into the 2026–27 marketing season. Rainfall would still help later maincrop fields, but after prolonged heat and moisture stress, some lost yield potential cannot be recovered.