As long as you take care of your new hydrangeas properly, you can keep them in pots for several years. Hydrangeas are a hardy, easy-to-grow plant, so don’t be intimidated if you’ve never grown them before. When the soil inside freezes and thaws, it cracks the poor pots wide open. Hydrangeas don’t need a lot of fertilizer, but you can feed your plants once or twice a year with a slow-release balanced fertilizer, a 10-10-10 granular fertilizer or commercial, composted manure. But in a pot? I had a potted hydrangea that I had bought but not managed to get planted, and i left it in my wagon outside. Except for two species (H. arborescens & H. paniculata), hydrangeas form flowers during the previous growing season (on so-called "old wood"). Hydrangeas need protection against the harsh temperatures that are felt in winter, namely freezing, thawing and extremely dry winds. Protecting the hydrangea during winter helps to ensure the plant is able to bloom each year. They r on my fenced patio in a bit of a microclimate. Choose a pot at least 500 mm wide. Never let the soil dry out completely, which will kill the plant. When possible, use large containers for plants that must remain outdoors—the greater volume of soil surrounding the plants will provide increased insulation around the roots. They spent all of last winter outside in the cold. Buy one at big box store in the sale area and put some water gel pellets in … Sold in almost all local nurseries and even at grocery stores like Trader Joe's they're not even expensive to buy. I live in zone 7/8 and have hydrangeas in pots. June 9, 2019 at 12:47 pm. This is a Bobo, one of my favorite short paniculata varieties. If you want to keep your hydrangeas in pots, urns or planters from year to year you can overwinter them. For example, if you garden in Zone 7, choose perennials, trees, and shrubs marked hardy to Zone 5 to increase the chance that the plants will survive the winter. While some plants can survive light frosts, others will die for good as soon as their cells freeze. Hydrangeas must be kept fully watered at all times. Don’t fertilize after July or August if you live in a warm climate. Most of these are hardy enough to survive local winter conditions… that is, if they’re grown in the ground. You can over-winter Hydrangea paniculata plants in pots as well. HYDRANGEAS IN POTS: If you live in a very cold area, you might try growing hydrangeas in large pots and putting them in a cellar or garage that freezes only lightly. Check locally to find out exactly which plants survive outdoors all year […] Hydrangeas can grow well in thinner metallic pots but thick terracotta doesn’t absorb heat as readily as a thinner metal or plastic pot which helps to stop the soil from drying out. Often I am asked, "Why don't my hydrangeas bloom?" Make sure your container will withstand the rigors of winter. However, if winter temperatures are above 5 degrees Fahrenheit, the hydrangeas are able to remain in good condition and do not … "In some parts of the country, temperatures can fluctuate from -10 to 30 degrees in a week or two. You can lay the pots on their sides on a waterproof tarp and fill with insulating material. We know that too much water is a bad thing. Tip 2: Look for the blue pots! Usually the answer lies in what happened to your hydrangeas during the preceding winter or right at winter’s end. It may mean the difference in winter survival for your plant. The hydrangea is a plant that can survive through winter and is not sensitive to low temperatures or even a freeze. Hydrangeas form their flower and leaf buds in fall, so freezing temperatures can kill off the buds before they have a chance to flower. : look for the winter temperatures drop the poor weather ensures that the roots and cut away any circled tangled. 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