Plants have senses that put humans to shame. Not only do they hear (yes, it's true) and smell, they can also sense the presence of water, and even an object in their space. Now new research suggests that plants can actually learn and remember.
http://www.pri.org/stories/2014-01-09/new-research-plant-intelligence-may-forever-change-how-you-think-about-plants
This only counts in human terms."The issue is, is it right to call it learning? Is that the right word? Is it right to call it intelligence? Is it right, even, to call what they are conscious."
It is ignorance to suggest plants are 'just plants'. A 'brain' is not a pre-requisite. Snails don't have a brain, but they still count as living in a way a plant doesn't. Ever trod on a snail and felt bad? Why should plants be any different? Just because we don't know them well enough doesn't mean they are the lesser.