The gardener said that a different tree on the site, known for having “fantastic dark reds”, had “gone red probably about a month earlier” than expected.
“It started to drop its leaves because it’s been very, very dry this year,” he added.
A local doctor created Winkworth Arboretum – in Busbridge, Godalming – in the early 20th Century.
According to the National Trust, which owns the site, the landscape changes with the seasons and provides a “vibrant colour display” in autumn.
Mr Alderton estimated that the garden’s spell in autumn colours was “extended probably by about six weeks”.
The garden was also seeing large oaks “dropping limbs”, he said.
“You do generally get used to the way that things work” and when they happen, he added.
Other horticulturists have suggested autumn leaves will be brighter coloured in 2025 because of summer weather conditions.
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