'As much as I love cold weather,' wrote Stephanie Rose in opening her Natural Companions column in April 2007, 'I have to concede that we experienced way too much of a good thing this past winter.  Long periods of extremely cold weather are the norm in many other parts of the country, and plants survive.  Here, however, our local plants may be accustomed to surviving the isolated sub-freezing night, but sustained, frosty temperatures