Plants monitor a wide range of information from their surrounding environment. They combine information of multiple sorts, and respond in an appropriate way. In plants there is no brain, and the information processing is distributed across the plant body. This video of a prize lecture by Professor Ottoline Leyser is made available via the Royal Society and is well worth watching (click the image to watch the recording):
Thinking like a vegetable: how plants decide what to do
This video of a prize lecture by Professor Ottoline Leyser is well worth watching.