Global Warming & Gardening
» Garden Planning
From a good article on the issue:
As avid observers of nature, most of us gardeners are probably aware at some level that changes are under way in the clockwork of many of our favorite plants. Spring seems to be arriving a little earlier for a lot of them these days. (In fact, one report says that between 1959 and 1993 the entire biological spring in North America shifted forward six days.)
Global Warming—Tracking the Effects of Climate Change on Plants