How to Do It. Winter time cuttings are tough as nails and require very little attention as you will see. Getting Your Hydrangeas Ready for Winter. If your hydrangeas live in a cold climate, late fall weather is the perfect time for them to harden off, you can use this same time to prepare them to make it through the coming winter. Early summer cuttings are known as softwood cuttings. Hydrangeas need protection from harsh winter temperatures, freeze, thaw, and drying winds. Do … And I’d let the plant tell me it was ready to wake up, I guess is what I’m saying. Keep the hydrangea in an unheated room with temperatures between 35 and 40 degrees Fahrenheit. All they need is a moderate watering couple of times during the winter. Hydrangeas are woody shrubs with beautiful white, blue, pink, or purple blooms. Before you move the plant into the garage, make sure the plant is completely dormant and all the leaves have fallen. ... We have a garage but is not finished – no roof yet but hubby said he is heating it when done. Protect Hydrangeas Over Winter With Mulch "The mulch’s job is to create a more consistent environment than what is happening outside," says Ryan McEnaney from Bailey Nurseries. Although these plants are hardy, special care should be taken to prepare hydrangeas for winter. When I put them in the garage for overwintering in the middle of November, all the leaves were green and healthy. ... in the garage, once it was in the 40s there consistently but still too soon to bring them out. This is the time that plants take to go into dormancy and refuel on energy for the next spring - similar to what animals do when going into hibernation. And make sure the area that it is in stays cold (ideally, 35–40 degrees). "In some parts of the country, temperatures can fluctuate from -10 to 30 degrees in a week or two. Hydrangeas that experience winter temperatures of no less than 5-10 degrees do not need winter protection. DE: For perennials and shrubs that you are keeping outdoors in the ground during the winter, you really do not need any protection. I'm overwintering in my UNheated pool house 10 to 15 different potted hydrangeas every year and they all doing fine. A garage or shed may provide the necessary temperatures. I'm nervous because this is my first time overwintering in the garage and I purchased the hydrangeas and roses this spring. Paniculata and smooth hydrangeas do not need protection in the United States and most of Canada. If/when you'll have a snow, throw the shovel of it on top of the pot and it will serve as a drip irrigigation on a warm days. Pin 4. Exactly what you do depends on what kind of hydrangea you have and where it lives. LTK: What are some basic steps for protecting plants through the winter? 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