The Still Secret Life of Plants...
The Secret Life of Plants by Joannah Underhill
"Plants may be able to respond to sounds and even make clicking noises to communicate with each other, according to new research.
If initial results can be confirmed and replicated, the latest findings could change our understanding of how plants sense their environment and communicate with each other. It would also overturn years of scepticism that plants can 'talk' in this way and give lie to the idea that animals are the only organisms capable of such feats."