Sharon Sweeny has a college degree in general studies and worked as an administrative and legal assistant for 20 years before becoming a professional writer in 2008. If you have temperatures that average in the 90s and 100s during the summer, it's best to plant mums where they will receive some afternoon shade. Our old commenting system has been replaced with Facebook Comments. In general, mums can be hardy in zones 4 to 9, but the colder your hardiness zone, the less likely they are to survive winter conditions. Mums would have a better chance of survival planted in the spring or early in the fall before they start blooming, but a green plant is a hard sell, and mums are far from most gardeners’ minds in the spring. Continue cutting mums back as needed until the first part of July. A member of the same family as edible cabbage, as well as broccoli, cauliflower and kale, flowering cabbage (Brassica oleracea) is grown primarily for its colorful fall foliage. Hardy flowers like pansies and mums should have little problem ... to freeze. There are a few varieties of mums that are truly annual. However, it isn’t just the frost that hurts plants in winter. Mums are susceptible to root rot diseases, so they are potted in lightweight potting mix that dries out quickly. Despite its height, Tatarian aster does not need staking. You can help any new mum purchases survive next winter by planting them in the ground soon after you get them in the fall. Many fall and winter mum deaths are probably due to plant or root desiccation. Mature plants can be planted at any desired spacing providing they are planted no closer than just touching their neighbor. The basic rule, before we start listing off plants, is that new growth gets frost damage. A product of the University of Minnesota's chrysanthemum breeding project, the hardy mum "Sesquicentennial Sun," (Dendranthema x grandiflorium "Sesquicentennial Sun") is a golden-flowered, frost-tolerant mum that is reliably hardy through USDA zone 3 with winter protection. These are most common in the floral industry and not likely to be found at garden centers. According to Glenn Monnin of the locally owned Monnin Fruit Farms, even a little frost on the top of pumpkins can cause them to deteriorate. Make a second application in mid- to late July. Those little bubbles that make up bubble wrap provide excellent insulation for your plants, buying them a few degrees of warmth, which is often all the difference you need between a plant killed by frost and a healthy plant that will live to see another day. Plant flowering cabbage in late spring to early summer in full sun, in the same manner as edible cabbage. Apply a layer of mulch over the top for added frost protection and to reduce soil moisture fluctuations. To do this, before the first hard frost hits, you need to mulch your mums very well. Tatarian aster quickly grows to form a large plant and is easily divided every three to four years. Most at risk plants during a frost. Include them in autumn indoor flower arrangements by cutting off the entire plant close to the ground. The Science Behind the Bubbles . Water them regularly throughout spring, summer, and fall. Mums need even, consistent watering for best results. Then they should bloom evenly in the fall. Always move your mums to safety on nights with a freeze, or extremely low temperatures in the forecast. She has experience in landscape design and maintenance and as an educator. Winter Care for Potted Mums. Water mums daily while they're blooming. The key with these plants, especially with the dry weather the Lawrence area has been experiencing, is watering. The other option is to forget about trying to overwinter mums and think of them as annual flowers. Even when they are sold as ‘hardy’, it may not mean winter hardy. Pinch the branch tips until late June to encourage the plant to branch out, which will cause it to produce more flowers. Plant garden mums in full sun in fertile, well-drained soil in mid-spring. Another thing to remember is that plants get watered every day or even multiple times per day in a greenhouse or garden center. Cover it with hay or straw when it finally succumbs to frost in late autumn. However, hardy mums may be labeled as annuals in error, because of nationwide markets or because the garden center doesn’t want to make any promises. A hard frost occurs when the air is cold and the ground is hard. Since half of the time in Zone 7b last frost occurs after April 15 be ready to protect your garden mums if we have one of those late frosts. Color and size Garden mums are available in an exciting array of colors–yellows from delicate creamy pastels to brilliant deep gold; soft pinks and lavenders; bright pinks and purples, dark reds, ivory, pure white, and bronze tones. Most mums can survive hot weather if they are given plenty of water, but heat tolerance varies widely by species and cultivar. To get overwintered mums to bloom evenly and delay the start of blooms to the fall season, plants need to be cut back or pinched. Depending on the size of the plants, this work might be done by hand or with hedge clippers. Garden mums (almost all the varieties sold at garden centers) are hardy to zones 4 and 5. Mums will generally lose their top growth after a hard frost and go dormant for the winter. But mums are typically purchased and planted in the fall when they are full of blooms, and when plants are blooming, they are putting energy into their flowers instead of their roots. 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