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NEWS RELEASE No: 1603928 AUGUST 2013

Bumper autumn for forest fruits expected as nature puts on a rare show

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Hawthorn berries

Visitors to woods and forests are in for a spectacular show of forest fruits this autumn, with the season looking like a bumper year for the fruits and seeds of many trees and shrubs, according to the Forestry Commission.

Early signs are that ash, English oak, field maple, beech, hawthorn, hornbeam and small-leaved-lime trees will produce large crops laden with seeds, fruits and nuts, all because of one of nature’s mysterious events, known as ‘masting’.

'Mast years’ are a natural phenomenon where some tree species produce very large crops of seeds in some years, compared to almost none in others. It’s not known exactly why mast years occur, but they have been linked to various causes over the years, including weather and climatic conditions.

Simon Toomer, Director of the Forestry Commission’s National Arboretum at Westonbirt, commented:

“Part of the fascination of experiencing a mast year is that we don’t completely understand the complex blend of factors that give rise to them and allow plants to co-ordinate the production of so much fruit and seed.

“Weather and climate can certainly affect fruit and seed production in plants, but we also see certain trees go through cycles of mast years. Beech, for example, produces a mast year every five to 10 years.”

With such an abundance of food available, seed-eating animals and birds, such as grey squirrels and jays, are expected to take advantage of the bounty to hoard supplies for later in the winter.

Seed-eating animal populations drop during non-mast years. As a result, in a mast year there are far more seeds than the population of predators can eat. This in turn means that more seeds will survive to the next spring and germinate.

With so much food available, wildlife that feeds on forest fruits are more likely to survive the winter in comparison to non-mast years, and breed the following  spring, indicating that the populations of seed-eating wildlife are likely to peak next summer.

Matthew Parratt, a scientist at the Forestry Commission's Forest Research agency, said:

“This year our forests, woodlands and back gardens will put on quite a show, with a number of our trees producing abundant levels of fruit and nuts.

“Fruits, seeds and nuts are still produced during non-mast years, but not in these quantities, so it really will be a strong year for our harvest and wildlife.

“This occurrence is a great opportunity to experience nature at its best, and with so much food you’re likely to spot more wildlife around the trees, so it’s a prime time to get out with the family and explore our woodland.”

The Forestry Commission has produced a spotter’s guide to trees and their fruits this autumn to help woodland visitors identify fruits and seeds. Events, fungi forays and guided walks are just some of the autumn events which visitors can also join in with this season.

For the fruit spotter’s guide and information about events and exploring Forestry Commission managed woods and forests this autumn, visit