![]() ![]() Interestingly, the water evaporating from the leaves supposedly will help to cool the plant down. Misting Dahlias for Afternoon Heat Reliefĭahlias are said to benefit from a misting or light shower with the garden hose during the hottest part of the day. Wood chips, bark, herbicide-free straw, hazelnut shells, sawdust, or leaves will also work well. Arborist chipsare my personal favorite mulch for dahlias. Mulching dahlias in warmer climates can help keep the plant cool. Mulching Dahlias to Keep Roots Coolĭahlia’s feeder roots are shallow: usually within the top one inch of the soil. It is important to strike a balance between providing your dahlias with enough sun, while providing a little relief from the hottest parts of the day. Also, some people construct a structure to hold shade cloth over their dahlias. Some people say that the secret to successful dahlias in hot climates is to plant them where they get a little bit of dappled shade in the hottest part of the day. Plant Where There’s Light Afternoon Shadeĭahlias need at least 6 hours of sunlight per day, but prefer 10-12+ hours per day. Buildings, rocks, and concrete tend to absorb more heat during the day which can increase the surrounding soil temperature at night. Different parts of your yard will be cooler at night than others. If you live in a place with warm nights (over 70 degrees Fahrenheit), pay close attention to where you plant your dahlias. Consider doing your own experiments and sharing the results with others. This means that just because a variety is not on a “heat tolerant” list, it does not mean it is not heat tolerant… It simply may not have been tested for heat tolerance yet. More are being bred by professionals and home gardeners every year. There are an estimated 4,000-5,000 dahlia varieties currently alive and maintained. ![]() Sad that a dahlia you want to grow is not on any of these lists? Keep in mind, not all dahlia varieties have been tested for heat tolerance. Here is a short list of heat tolerant varieties by Old House Gardens. ![]() (The Dahlia Society of Georgia also offers a Dahlia Growing Guide for Southern Gardeners). They offer two different lists in PDF form: The best list of heat tolerant dahlia varieties is put together by the Dahlia Society of Georgia. Thankfully, people are constantly experimenting with varieties, and create lists to help future hot-weather dahlia enthusiasts succeed. Of course, every dahlia variety is different. Some varieties of dahlias can simply handle the heat a bit better than others. The first thing you can do to ensure dahlia success in hot climates is start with heat tolerant dahlia varieties.
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