Darganfyddwch pam mae boncyffion sy'n pydru, stympiau sy'n madru a choed sydd wedi syrthio i gyd yn hanfodol i adferiad byd natur.

The autumnal colours of deciduous trees are one of the big natural spectacles of the year. But why do leaves change colour in autumn, and why do some leaves go red, while others turn yellow?

Dewch i gwrdd ag offerynnau taro corws y wawr…

This week is National Tree Week (Saturday 28 to Sunday 6 December) - find out how can you take part in the UK’s biggest annual tree celebration!