Referred to as phenological plants, phenology being the study of timing in nature, the long duration of the ongoing project allows researchers plot changes in the arrival of the seasons even though the arrival of spring can vary significantly year to year.
Spring leafing can vary by up to a month depending on the year, but the project shows that climate change has brought leafing forward in Europe by approximately three weeks, a fact that might be “invisible” were the data not being collected. But four kilometres a year is much, much faster than any plant can migrate across a landscape in response to changes in climate zones, he says.
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