Deadhead hydrangeas early; prune timing depends on whether they bloom on new or old wood. Protect plants with mulch, burlap, or cages in cold climates; move potted hydrangeas indoors below 45°F.

Plants are susceptible to dying over winter thanks to the hard weather. The cold can kill a plant, as can the wind, and hydrangeas are certainly not immune. What's more, it's difficult to tell if your ...