Don't let freezing weather ruin next year's flowers.

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A hydrangea in full bloom is a colorful sight to celebrate. But, did you know that some types of hydrangeas actually produce their flower buds during the growing season prior to bloom? The young, tender buds form in late summer and then must hang on through whatever winter weather comes their way. If cold winds, subzero temperatures, and freeze-and-thaw cycles damage those buds, you can forget about seeing any hydrangea flowers the following spring or summer. Giving your plants some extra care in colder regions will help maximize their blooms. Here's what you can do to prepare your hydrangeas for winter so you'll be sure to enjoy their beautiful flowers once again.

Blushing Bride Bigleaf Hydrangea
Credit: Dean Schoeppner

1. Know your hydrangea type.

The first step in planning winter care is to get a good idea of what kind of hydrangea you are growing. If your hydrangea doesn't bloom in spring, but instead blooms exclusively in mid- to late-summer, it is likely a smooth or panicle hydrangea and produces its flower buds in spring. Because smooth and panicle hydrangeas develop flower buds and bloom all in the same growing season, they rarely require extra winter care.

Hydrangeas that bloom in spring and very early summer are likely bigleaf or oakleaf hydrangeas. These hydrangeas bloom from flower buds that were created the previous summer or fall (a few varieties such as Endless Summer hydrangeas also form buds the same year as they bloom). If extreme cold or drying winter winds are a challenge in your region, consider adding some winter protection around these spring- and summer-blooming shrubs. If you live in a milder climate and haven't had trouble with your bigleaf or oakleaf hydrangea blooming in the past, it's likely that you don't need to protect your plant.

2. Protect spring and early summer hydrangeas.

Flower-bud protection is the goal of winter care for vulnerable hydrangeas. The simplest method is to mound shredded leaves or bark mulch around the base of the plant to about 12 inches or so. Put the mulch mound in place in late fall after the ground freezes and uncover plants in spring when temperatures begin to stay above freezing.

3. Water plants well.

Hydrangeas, like all trees, shrubs, and perennials, overwinter best when they are fully-hydrated. Water hydrangeas deeply a couple of times in fall. Winter winds can quickly dry out hydrangeas. Ample moisture in fall will help stems withstand freezing blasts of air.

4. No need to prune.

If you trim your plants in fall or winter, you may end up removing flower buds for the following year on bigleaf and oakleaf hydrangeas. Plus, leaving the old flower heads on the plants will add some interest to the winter landscape. It's best to save hydrangea pruning chores until spring or summer after plants bloom (don't worry, the new growth will soon hide any dead stems from the following year).

5. Bring potted hydrangeas inside.

Potted hydrangeas overwinter best in a garage or basement where the temperature stays cool, but does not freeze. The plants will go dormant, but you'll still need to water the pots occasionally, about once a month, to keep the roots moist, until spring.

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