Earlier sightings of the signs of spring – from the first leaves on trees to early butterflies – could be the new norm as the climate changes, conservationists said.
The Woodland Trust runs the Nature’s Calendar citizen science scheme, which gathers sightings of the signs of the seasons from the public. One of the first trees to come into leaf is the elder tree and for the last five years, records of first leafing collected by members of the public have been earlier than the 20-year average by four to 16 days, the charity said.
The spring index is calculated from average dates of the first flowering of hawthorn, first flowering of horse chestnut, first appearance of an orange tip butterfly and first sighting of a swallow, and also draws on Nature’s Calendar data. Dr Judith Garforth, citizen science officer at the Woodland Trust, recorded elder first leaf on February 20 in North Yorkshire and said spring is spreading north rapidly.
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