When to Cover Hydrangeas

Winter

• Hydrangea blooms grow on old wood. When winter weather compromises a plant, the hydrangeas may not bloom in the spring. To protect hydrangeas from wind and frost, cover them when temperatures are in danger of dipping below freezing. Though blankets and tarps are capable of shielding plants from frost, they may cause harm if not placed correctly. Surround the hydrangea with chicken wire or mesh, and drape the covering over the barrier. Do not throw a blanket directly over the plant. The covering is capable of breaking and bending brittle wood. This breakage will make the hydrangea susceptible to bacterial, fungal and insect invasion during the spring, when sap rises and wounds are open. Some growers have protected hydrangea from wind and frost damage by surrounding the plant with mesh and loosely placing leaves in the empty spaces between the plants and the barrier.

Summer

• Hydrangeas have large leaves, making them susceptible to heat damage. The large surface area easily surrenders moisture to the environment and is capable of being burned. Containerized hydrangeas can be moved from direct sunlight and protected, but those in the ground will benefit from shielding. Place a tarp or other covering above the hydrangea if it receives direct afternoon sunlight. Remove the overhead covering at night to allow air to circulate.

Site

• Hydrangeas prefer moist soil, morning sun and warm temperatures. They often are grown in containers on sunny patios. Growing hydrangea in containers is useful in areas where evening temperatures dip near freezing during the growing season. The plants can be moved indoors or another protected area. Plants also can be taken out of direct afternoon sun. In-ground hydrangeas should be planted in well-draining soil and in dappled shade. Water is essential to maintaining hydrangea health. Drip irrigation and mulching keeps the base of the plant evenly moist. Avoid overhead watering, as this can contribute to powdery mildew and other foliar diseases. Healthy plants have a better chance of surviving harsh winters, but they should still be covered when temperatures drop below 35 degrees Fahrenheit.

Considerations

• Peegee hydrangea is capable of surviving even when surrounding air quality is poor. It also is tolerant of salt and seaside conditions. Because it is not practical to protect outdoor plants from all negative environmental conditions, make an accurate assessment of the growing conditions and choose a hydrangea cultivar suited for those conditions.