Southeast Asia’s tropical forests are renowned for their biodiversity, but at the same time face significant threats from the expansion of oil palm plantations. With global demand for palm oil rising, the urgency for effective restoration strategies in these landscapes has become critical. A long-running experiment led by Göttingen University, Germany, and including the IPB University, Bogor and Jambi University in Indonesia, has investigated how ecological restoration promotes biodiversity recovery in oil palm plantations in Sumatra. Their findings reveal that establishing islands of trees within large oil palm monocultures can promote the recovery of native tree diversity through natural regeneration. The results were published in Science.