When I put them in the garage for overwintering in the middle of November, all the leaves were green and healthy. by margaret September 23, 2018 September 23, 2018. Hydrangeas are woody shrubs with beautiful white, blue, pink, or purple blooms. 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. How to Do It. Before you move the plant into the garage, make sure the plant is completely dormant and all the leaves have fallen. Paniculata and smooth hydrangeas do not need protection in the United States and most of Canada. Exactly what you do depends on what kind of hydrangea you have and where it lives. overwintering tender plants, and hydrangea issues: q&a with ken druse. I'm nervous because this is my first time overwintering in the garage and I purchased the hydrangeas and roses this spring. Although these plants are hardy, special care should be taken to prepare hydrangeas for winter. Getting Your Hydrangeas Ready for Winter. Early summer cuttings are known as softwood cuttings. 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. Depending on your climate zone, you may need more or less protection to winterize hydrangeas. LTK: What are some basic steps for protecting plants through the winter? Pin 4. I also have porches with a roof but open to the elements. Hydrangeas that experience winter temperatures of no less than 5-10 degrees do not need winter protection. 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. In the past few weeks, the leaves are starting to turn yellow (on the roses and mums) and dropped. Hydrangeas need protection from harsh winter temperatures, freeze, thaw, and drying winds. A garage or shed may provide the necessary temperatures. ... in the garage, once it was in the 40s there consistently but still too soon to bring them out. 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. All they need is a moderate watering couple of times during the winter. Tweet. ... We have a garage but is not finished – no roof yet but hubby said he is heating it when done. Keep the hydrangea in an unheated room with temperatures between 35 and 40 degrees Fahrenheit. I'm overwintering in my UNheated pool house 10 to 15 different potted hydrangeas every year and they all doing fine. Winter time cuttings are tough as nails and require very little attention as you will see. 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