Also: Pumpkins are carved and a plethora of Halloween fun and scares By Denny Dyroff, Staff Writer, The Times Longwood Gardens’ annual Chrysanthemum Festival opens this weekend. As soon as the temperatures begin to drop, the only plants that really hang on and continue to have flowers are hardy pansies, which can bloom all winter long, and chrysanthemums, which are primarily autumn flowers. Longwood...