winter protection on Hydrangea
Quick answer
If your Hydrangea has winter protection, the most likely cause is: Macrophylla and Quercifolia hydrangeas set their flower buds in late summer for the following year. Severe winter freezes or late spring frosts can kill these tender buds, resulting in a plant that grows lush green leaves but produces zero flowers.
Start here:
- 1. Wait to prune off dead-looking wood until late spring; what looks dead often contains viable buds.
- 2. If a late spring frost is forecasted after plants break dormancy, cover the entire bush with frost cloth, blankets, or burlap overnight (remove during the day).
Why Hydrangea gets winter protection
Macrophylla and Quercifolia hydrangeas set their flower buds in late summer for the following year. Severe winter freezes or late spring frosts can kill these tender buds, resulting in a plant that grows lush green leaves but produces zero flowers.
Other documented causes on hydrangea:
- • Exposure to severe winter frosts can kill the above-ground canes and dormant flower buds on old-wood blooming hydrangeas, even if the roots survive.
How to reverse winter protection on Hydrangea
- 1
Wait to prune off dead-looking wood until late spring; what looks dead often contains viable buds.
- 2
If a late spring frost is forecasted after plants break dormancy, cover the entire bush with frost cloth, blankets, or burlap overnight (remove during the day).
Keep winter protection off this Hydrangea
In cold climates (Zone 6 and below), wrap the shrub in burlap and fill the enclosure with dry oak leaves or straw in late fall to insulate the stems. Alternatively, plant 'remontant' (reblooming) varieties like Endless Summer that bloom on both old and new wood, ensuring flowers even if old buds freeze.