SENSING SENSES. “We did an experiment with two climbing bean plants. If you put a single support between them, they compete for it. “What is interesting is the behaviour of the loser: it immediately sensed the other plant had reached the pole and started to find an alternative. This was astonishing and it demonstrates the plants were aware of their physical environment and the behaviour of the other plant. In animals we call this consciousness.”
http://www.bbc.com/news/science-environment-34849374