Why is there a bumper mushroom season in the UK this autumn?

Foragers across the UK are reporting an unusually prolific autumn mushroom season, driven by weather conditions that have favored fungal growth. The Royal Horticultural Society (RHS) has forecast that sightings could reach record levels, attributing the boom to a pattern of drought followed by damp autumn weather.

Colin Unsworth, a Lancashire-based forager and operator of Forest Horizons in Adlington, described the current season as “bumper” for certain species. He noted that iconic varieties such as the fly agaric, recognizable by its red cap with white spots, and blushers have been found in abundant numbers.

However, the abundance is not universal. Unsworth highlighted that porcini mushrooms, also known as penny buns or ceps, remain scarce. These prized fungi, valued by chefs for their robust flavor, are facing an EU-wide shortage. Unsworth cautioned that despite the overall plenty, some sought-after edible species have been difficult to locate.

Beyond availability, safety remains a critical concern. Unsworth issued a stark warning against consuming wild mushrooms unless identification is absolute. He pointed out that dangerous poisonous species, such as the brown roll-rim, can closely resemble edible varieties. “You get look-alike mushrooms,” he said. “They can be really dangerous.”

The RHS explained that prolonged heat and drought preceding a wet autumn create ideal conditions for many fungi. Their advice team recorded a 43% increase in inquiries regarding garden fungi after the 2025 drought compared to the previous year. Some species thrive on the extra dead plant matter left by dry spells, while others emerge as trees respond to stress.

Jassy Drakulic, a senior plant pathologist at the RHS, noted that gardeners could expect to see a “remarkable variety” of mushrooms and toadstools in lawns, borders, and around trees. She emphasized that fungi are generally a positive indicator of a healthy ecosystem, playing a vital role in breaking down organic matter and supporting plant health.

For enthusiasts like Unsworth, the autumn season represents the highlight of the foraging calendar. He described a typical haul as potentially yielding 20 to 30 different types of edible mushrooms. “In the autumn time, mushrooms take centre stage and they’re so beautiful and they’re so varied,” he said, adding that studying them helps connect different parts of the landscape.