Orchid Extravaganza at Longwood Gardens is on view January 20 through March 25. Photo by Daniel Traub. EAST MARLBOROUGH — Longwood Gardens provides a colorful escape from the winter blues this season during Orchid Extravaganza, running January 20 through March 25. The heated 4-acre conservatory transports guests into a warm oasis featuring thousands of vibrant orchid blooms displayed in extraordinary...