When given ample room, monarda will spread rapidly, forming dense tufts of blooms that are a highlight of the summer garden. Monarda ‘Achall’ ‘Grand Marshall’/Mt Cuba Center. Cultural practices can reduce the severity of powdery mildew. And its lavender-pink flowers were a favorite among bees. In the past I have removed the stalks that show the powdery mildew and the plant just doesn’t do well. North Carolina State University & University of Vermont research also shows this variety to be very resistant compared to others. The stiff, rigid stems give it a different look from the more delicate varieties. It is about one foot shorter than the popular variety ‘Jacob Cline’, with which it shares characteristics. Monarda ‘Gardenview Scarlet’ was the only red-flowered cultivar to rank among the top performers. Meanwhile, the experts at Mt. They found that many varieties developed serious problems with powdery mildew. The dark purple blooms lasted for a solid three weeks in July. As a result, most gardeners opt to cut infected stems back early and hope things will improve the next year. One of the most mildew-resistant varieties available, with no winter damage, according to the Chicago Botanical Gardens Monarda trials in the mid-late 1990s. According to the Mt. Cuba researchers, this cultivar exhibited the best resistance to powdery mildew. (adsbygoogle = window.adsbygoogle || []).push({}); © 1972 - 2020 National Gardening Association, Times are presented in US Central Standard Time, Today's site banner is by zuzu and is called "Salpiglossis". COMPARISON OF POWDERY MILDEW RESISTANCE AMONG BEE BALM CULTIVARS. Powdery mildew is a common fungal disease on bee balms. It will cause the leaves to first look white, then yellow and die. Click to share on Pinterest (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), 6 Top Monardas Join The Resistance Against Powdery Mildew. However, short, silvery hairs lend its leaves a dull green appearance. It also has the darkest purple flowers of all of the monardas. Learn how your comment data is processed. are most likely due to powdery mildew. The one downside is that ‘Purple Rooster’ doesn’t produce quite as big a floral display as the other species. Monarda fistulosa ‘Claire Grace’/Mt. If given plenty of sun and well-draining soil, it will flower from mid to late summer. No one plant performed perfectly, but there were several deserving of honorable mention. It affects several plants including lilacs, roses, zinnias, phlox and peonies. This site uses Akismet to reduce spam. It tended to have little sections that dried out, but overall exhibited good resistance. Powdery mildew is the culprit. If mildew is a problem in your garden, consider growing this 3-foot-tall beauty with bright pink flowers. Unfortunately, they look pretty ugly by the end of the season. Mold thrives in areas where air circulation and sunlight are low, and can be an unattractive taint on any plant. Powdery mildew is one of the most common and easily recognized plant diseases. Its large, 4″ wide flowers attracted hummingbirds in particular. For more information on Mt. Monarda fistulosa ‘Claire Grace’, one of the heaviest flower producers, ranked high for its sturdy, stems and good disease resistance. Cuba Center set out to identify which varieties offer the best resistance. Master Gardener Jan B. covers the "Powdery Mildew" fungal disease in this edition of The Master Gardener Minute. In the trial period, no more than 5 percent of its foliage became infected. However, ‘Jacob Cline’ struggles with powdery mildew. This common fungal disease is caused by a fungus whose spores overwinter in garden debris and are spread by the wind. Cuba Center and its many plant trials, click here for mtcubacenter.org. The symptoms on your bee balms (Monarda spp.) Examples of resistant species include 'Violet Queen,' 'Marshall's Delight,' 'Gardenview Scarlet' and 'Stone's Throw Pink,' according to studies conducted by the University of Vermont. While all of the above new cultivars exhibited good resistance to powdery mildew, the fungus still occasionally appeared on leaves and stems. Now it is looking spindly, blooms and the petals just fall off immediately. The good news is that, while it may make them unsightly, powdery mildew rarely permanently damages plants. The least resistant cultivars, generally with 80-100% of foliage showing mildew each year, included Adam, Cambridge Scarlet, Croftway Pink and Souris. Monarda ‘Purple Mildew Resistant’ is aptly named- not a single incidence of powdery mildew was observed over the three-year trial. Bee Balm (Monarda didyma) Posted by threegardeners. Unfortunately there is little that can be done in controlling or eliminating powdery mildew from plants. That being said, the best strategy is always to choose plants that are resistant or at least tolerant to the disease. Bee balm is the common name for a fragrant flowering plant in the Monarda genus. If given plenty of sun and well-draining soil, it will flower from mid to late summer. Use these convenient icons to share this page on various social media platforms: Articles → Plants → Edibles → Herbs → Perennial Herbs, Articles → General → Garden Care → Pests and Problems. , lilac ( Syringa spp. foliage became infected ’ ‘ Grand Marshall ’ s going. Strategy is always to choose plants that are a highlight of the monardas about one foot shorter than the variety. 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