Vast swathes of the country’s trees have been killed off by droughts and infestations, in a trend sweeping across Europe. A shift towards more biodiverse cultivation could offer answers

Even the intense green of late spring cannot mask the dead trees in the Harz mountains. Standing upright across the gentle peaks in northern Germany, thousands of skeletal trunks mark the remnants of a once great spruce forest.

Since 2018, the region has been ravaged by a tree-killing bark beetle outbreak, made possible by successive droughts and heatwaves. It has transformed a landscape known for its verdant beauty into one dominated by a sickly grey.