Frost can kill the hydrangea's flower buds, which would prevent the plant from flowering. When to prune your potted hydrangea is based on the variety. Plants may need covering if there's a long period of 25-degree weather, but they probably can survive a very short-lived cold snap during the night, Reeves said. The draft creates a chilling effect on the plant. Most potted, gift hydrangeas fail to thrive because they’re kept indoors too long. When exposed to the cold, young roots are unable to acclimate and die back. Others die because they’ve been raised in a greenhouse, and even if planted outdoors, they’re not cold hardy in your part of the country. Choose a pot at least 500 mm wide. Oakleaf Hydrangeas are definitely the most popular kind in our region, as they can tolerate heat without getting too fatigued. Protect potted hydrangeas from the harsh cold by bringing them indoors, prior to the first frost. Denver can get really cold, and mophead hydrangeas (H. macrophylla) are probably one of the least cold hardy species. ; Remove the shrub from the container, gently tease the roots and cut away any circled or tangled roots. If you are planning to grow a perennial in a pot, zone up to ensure success! Cold hydrangeas survive over the winter months with nominal effort. Some are even just fine in zone 2, which can get as cold as -40 C! BCLiving keeps you in the know on everything West Coast, highlighting local trends, eats, entertainment and travel ideas. While it can seem tedious, protecting your potted hydrangeas against the winter winds, cold, and frost. Deadheading is the process of removing dead flowers from the plants. You may also like Explore 8 … You can also cover the plant with a bubble wrap for added protection in patio or balcony. Please note: For gardeners in Zone 5, we advise planting H. macrophyllas in a sheltered location and giving them a winter mulch. Whether or not hydrangeas need protection depends on how cold the winter temperatures drop. Potted hydrangea (greenhouse) can be tempremental. If you reside in a hot climate, the UConn Home & Garden Education Center advises that your best option is the oakleaf hydrangea (Hydrangea quercifolia). H. macrophyllaa comes in a wider color range and I guess that’s the best that can be said for it. Climbing hydrangea (Hydrangea petiolaris) round out our list. Hydrangea can handle sun and may wilt slightly mid day in full sun but will revive with moisture and evening. In the event of a freeze or if you are growing your hydrangea in colder climates, the plant must be protected to survive. Since hydrangeas flower prolifically, fertilizing is a good idea. In general, hydrangeas (Hydrangea spp. How To Take Care Of Potted Hibiscus In Cold Weather. Hunker may earn compensation through affiliate links in this story. Ouch. All hydrangea species need between six and eight hours of full sun for maximum bloom. Here's what to do. I planted two blue hydrangeas in pots. Along with pruning, properly watering your hydrangea is crucial—the prefix of the plant's name, hydra, even indicates so! Hydrangeas usually don't need to be fertilized unless the soil is really lacking in nutrients. Always above -10 degrees F – Protect Hydrangea aspera and certain selections of Hydrangea macrophylla. The draft creates a chilling effect on the plant. Once established, all commonly grown hydrangea species are cold hardy in this temperature range. If the tree is mature, a short bout of frost is not likely to kill the tree, but damage and death is possible if temperatures below 29 degrees Fahrenheit are sustained. Answer: Most hydrangeas are deciduous, which means they drop their leaves in winter. During hot, dry weather, a hydrangea may require up to 2 inches of water a week, says the UMass Extension Landscape, Nursery & Urban Forestry Program. You can move the plant outdoors but poinsettia frost damage is a real threat if your area’s temperatures dip below 50 degrees Fahrenheit (10 C.). Ouch. So you won't lose a year's flowers to cold winters or pruning at the wrong time. Because it blooms later than most other species (summer into fall), it fills the gap in hydrangea color. It is distinguished by its cone-shaped flower heads. In most hardiness zones, you can leave hydrangeas on your patio unprotected, as they are very cold hardy. Hydrangeas, as you are probably well aware, are a great patio container plant. Unlike oakleaf hydrangea (H. quercifolia) and once-blooming French hydrangeas, panicle hydrangea blooms on new growth. There are many types of hydrangeas with … When the hydrangea is dry we give it lots of water and if it still looks droopy we add more thinking it didn’t get enough. It thrives in full, blazing sun and pests don't bother it. If you want to choose a species that will work anywhere in Arizona you might choose from the following: Bigleaf Hydrangea, Oakleaf Hydrangea, or Smooth Hydrangea. Most of the new selections … You can grow it from Canada all the way down to the Gulf Coast (USDA Zones 3-9). These floriferous beauties are used extensively in landscape design as colorful accents or specimens, natural hedges and buffers, or in groupings in landscape borders and home foundation plantings. If these are the species in your garden, you don’t have to worry about winter kill on hydrangea. If winter temperatures do not go below five to 10 degrees Fahrenheit, or only dip into single digits for an hour or so, hydrangeas should be okay without winterizing. 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