Time to start posting significant facts from a variety of sources.
Temperatures in Concord have warmed by 3 degrees Celsius (5 degrees Fahrenheit) over the past century. In this same time period, tree and wildflower leaf-out dates have shifted significantly.
“Wildflowers are now leafing out about one week earlier than 160 years ago, but the trees are leafing out two weeks earlier,” said Caitlin McDonough MacKenzie of Boston University. “Understory wildflowers need the sunny conditions before the trees leaf out for their energy budgets.”