can hydrangea forecast winter weather
PROTECTING MOPHEADS AND LACECAPS IN WINTER. The information on this page is for H. macrophylla, which is the typical blue and pink mophead or lacecap hydrangea. PG (paniculata) or Annabelle hydrangeas do not need protection in the United States and most of Canada. Hydrangeas that experience winter temperatures of no less than 5-10 degrees do not need winter protection. If the temperature falls into the single digits for only a few hours at a time, the hydrangea should not be harmed.