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Hydrangeas Need Extra Care in the Winter—4 Tips Gardeners Follow to Keep Them Alive

If your hydrangeas put on a spectacular summer show of blooms they deserve some attention for the winter. If they don't perform very well, they deserve winter care even more to encourage better performance next summer. We've gathered five tasks and some tips you should be doing to care for hydrangeas...

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If your hydrangeas put on a spectacular summer show of blooms they deserve some attention for the winter. If they don't perform very well, they deserve winter care even more to encourage better performance next summer.

We've gathered five tasks and some tips you should be doing to care for hydrangeas in the winter to keep your plants healthy and happy.

Provide Winter Moisture to Hydrangeas
Hydrangeas are thirsty plants that require hydration throughout the growing season and even in dormant months. If you live in an area where the ground freezes hard, continue to water deeply and consistently until the ground freezes solid.

In areas where the ground does not freeze, hydrangeas should be watered deeply but infrequently during the winter. Monitor rainfall carefully because winter precipitation may offer enough moisture.
Add Nutrients the Right Way

Commercial fertilizers, especially those with a high nitrogen NPK count, should never be used on hydrangeas at the end of the growing season.

The nitrogen will cause a sudden spurt of green growth that will be killed with the first frost. Instead, supplement the soil with a few inches of compost that will break down slowly during the winter months.

In warmer hardiness zones (7 and above), apply the compost in late fall or early winter by layering it directly over the soil. In colder zones, wait until the ground has frozen and top-dress the soil with compost before you apply mulch to protect the roots.

Protect the Root System With Mulch
Whether you are in an area where the ground freezes or in a warmer zone, adding mulch will protect the roots by acting as an insulator and help retain moisture. After the ground freezes or in early winter, add about six to eight inches of mulch over the compost top-dressing.

Don't mulch too early in warmer zones because that can cause rotting, disease, and provide shelter for munching rodents. Remember that thick mulch should be removed when spring buds appear.

For small plants in cold temperature zones (6 and lower), the mulch can be applied as a mountain covering the majority of the hydrangea.

Protect Hydrangeas With a Burlap Wrap
If you live in zone 6 or lower, your hydrangeas will benefit from a burlap wrap to protect them from heavy snow drifts and drying winter winds. Growers in warmer zones don't need to worry about wrapping plants unless the hydrangeas are on a northern slope and temperatures below 0 degrees are expected for multiple days.

One way to construct a burlap wrap is to place bamboo stakes in a circle around the hydrangea.

Wrap a couple of layers of burlap around the stakes and secure it with twine.
For larger plants or a bed of hydrangeas, build a frame with four or more posts and stretch chicken wire around the posts. The wire should be at least six inches taller than the top of the hydrangea.
Add a couple of layers of burlap around the outside of the wire and secure it often with twine.
Prune Hydrangeas Wisely

While winter pruning is recommended for fruit trees, it's not the best time to prune hydrangeas except to remove limbs broken by strong winds or heavy snow.

The best time to prune a hydrangea to produce the most blooms next summer depends on whether the shrub blooms on new wood (growth produced in the current season) or old wood (growth from the previous season).

New wood hydrangeas(panicle and smooth varieties): Wait until early winter when the plant is dormant. Fall or winter pruning can be done to remove dried blooms and help shape the plant.
Old wood hydrangeas (mophead and oakleaf): should only be pruned immediately after flowering in the spring and summer. Most horticulturists recommend no pruning after August 31.
Additional Tips for Winter Hydrangea Care
Bring container-grown hydrangeas indoors when temperatures fall below freezing. Water the plants sparingly to prevent root rot.
To help hydrangeas overwinter in extremely cold zones, planting them near a heat-holding structure like a brick wall or foundation. Choose a spot with bright sunlight and protection from winter winds.
Regularly inspect sheltered or wrapped hydrangeas and clear away heavy snow.

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