Hydrangeas are an ideal shrub for usda hardiness zone 7. If you live in an area with freezing temperatures, it is a good idea to protect your plants from freezing winter temperatures. Deadheading Hydrangeas How To Grow Care Prune Nikko Blue Endless Summer 8 More Varieties Organic Gardening Geek They tolerate more severe pruning while still blooming each year. Hydrangea winter care zone 7 . It will help you keep the plant thriving long term. Since endless summer ® hydrangeas bloom on last year’s growth (“old wood”) as well as the current season’s growth (“new wood”), you will get the most flowers by protecting the flower buds on the old wood. Whether or not hydrangeas need protection depends on how cold the winter temperatures drop. Autumn is the best time for hydrangea planting. Most varieties are winter hardy in zone 6 with shade to part sun and moist soils. Limelight hydrangeas feature dramatic color changes through the season; Autumn is the best time for hydran...