Cascade Hydrangea - FAIRYTRAIL Green

Hardiness on the Cascade Hydrangeas is a bit of an unusual situation. The plants themselves are actually quite hardy - as hardy as H. macrophylla , perhaps a bit more. However, because they bloom so much earlier in the season than other hydrangeas, their flower buds are more susceptible to damage from unexpected spring frosts and freezes. To combat this, we have found that planting them in sites where they are shaded in the morning is very helpful. It allows any ice crystals on the plant to melt away very gradually, reducing the risk of tissue damage. Protecting them with old blankets on those spring nights and mornings when unusually cold weather threatens is also a viable approach.