Research around the plant kingdom has evolved as scientists from several backgrounds have decided to look and listen to the world differently modifying their questions and research agenda. Rather than speak of new discoveries, it might be better to speak of accidents leading to paradigm changes. A few classic examples: the réalisation that plants communicate through volatile organic compounds (acacia trees sending out airborn signals to other acacias) or through the mycelium network in the earth and between species (sharing nutrients or warning of attackers). More here.
But there is another type of example of tree behaviour that appears quite stunning. Plants are not as silent as it is assumed. There is more to be heard than just rustle of the wind in the leaves.
Bernard Krause, bioacoustics sound engineer has been recording the natural world for decades and has recorded a number of unusual phenomena, meriting that we stop and think twice.