COMPLEX PROBLEM. “It is very clear that the construction and maintenance of an accurate spatial map of a large plant such as a tree would demand huge processing power. Thousands of leaves and roots, each having a need to sense their local environment to serve their own needs, would produce very large amounts of data. The data would be changing by the minute as the leaves fluttered in a breeze and the roots explored their very heterogeneous environment.”
http://aob.oxfordjournals.org/content/93/4/345.full