"In some parts of the country, temperatures can fluctuate from -10 to 30 degrees in a week or two. And make sure the area that it is in stays cold (ideally, 35–40 degrees). by margaret September 23, 2018 September 23, 2018. Before you move the plant into the garage, make sure the plant is completely dormant and all the leaves have fallen. Although these plants are hardy, special care should be taken to prepare hydrangeas for winter. Tweet. ... in the garage, once it was in the 40s there consistently but still too soon to bring them out. Exactly what you do depends on what kind of hydrangea you have and where it lives. Winter time cuttings are tough as nails and require very little attention as you will see. 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. Keep the hydrangea in an unheated room with temperatures between 35 and 40 degrees Fahrenheit. LTK: What are some basic steps for protecting plants through the winter? Hydrangeas need protection from harsh winter temperatures, freeze, thaw, and drying winds. Depending on your climate zone, you may need more or less protection to winterize hydrangeas. A garage or shed may provide the necessary temperatures. ... We have a garage but is not finished – no roof yet but hubby said he is heating it when done. Hydrangeas are woody shrubs with beautiful white, blue, pink, or purple blooms. 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. Pin 4. overwintering tender plants, and hydrangea issues: q&a with ken druse. Paniculata and smooth hydrangeas do not need protection in the United States and most of Canada. Getting Your Hydrangeas Ready for Winter. How to Do It. 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. When I put them in the garage for overwintering in the middle of November, all the leaves were green and healthy. In the past few weeks, the leaves are starting to turn yellow (on the roses and mums) and dropped. I also have porches with a roof but open to the elements. 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. And I’d let the plant tell me it was ready to wake up, I guess is what I’m saying. I'm nervous because this is my first time overwintering in the garage and I purchased the hydrangeas and roses this spring. All they need is a moderate watering couple of times during the winter. 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