Before the spring flowering season explodes, take a ramble with Nancy Rose, Editor of Arnoldia, the magazine of the Arnold Arboretum, to observe and delight in early bloomers like willows, witch hazels, and pussy willows.  The walk will take place Wednesday, March 20, beginning at 2 pm at the Arborway Gate.  Register on line at www.arboretum.harvard.edu (no fee), and in case of inclement weather, call 617-384-5209.  Beautiful photo from www.shecurmudgeon.com.