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How To Look After Hydrangeas During Winter. Luc Balemans a hydrangea expert in Belgium warns that some winter covers similar to the one at the left may rub the ends off the branches in windy weather and in turn rub off the bloom buds. Cut the hydrangea stems to the desired length.
Sprinkle growmore on top of the soil and add some compost. Hydrangeas also lose their leaves during fall but the brown stalks remain upright. Also deadheading will help your plant to get that healthy look which is quite important.
Choose a large enough pot for the mature size of your specific hydrangea at least 18 inches in diameter.
The same applies if your winter is rainy. In-ground Hydrangeas Winter Protection. For even greater protection cover the shrub with a wire cage or build a cage around it. The same applies if your winter is rainy.