Yes they do, not by sounds, but by chemical signals. Released when leaves are subject to herbivory. Plants can even communicate with parasitic wasps to lay their eggs in caterpillars when they are eating their leaves.
They can be detected in the air and underground in networks.
If you have a look on google scholar, theres heaps of research journals on them.
Had to do an assessment on plant communication and it is quite interesting and proven.
Sorry to jack thread pacifist persiangirl.