In the dark, bitter days of winter, when the ground lies frozen and snow-covered, it can be hard to believe that mere months before, gardens and window boxes were bursting forth with fragrant, colorful blossoms. Today on the frosty walk home, at least we can pick up cut flowers at the store to remind us of the spring to come. But before the technological miracles of hothouses and refrigeration, flowers could only be captured for the winter months...