If you see black or dark smudges on your sedum, consider reducing the moisture in the soil. It affects herbaceous plants and some woody plants but is most commonly found on ajuga, anemone, campanula, chrysanthemum, delphinium, hosta, hydrangea, iris, narcissus, phlox, rudbeckia, scabiosa, sedum, and tulip. Remove infected plants and replace with another unrelated perennial. This was during a period of little rain and I haven't watered them. This fungal disease causes the damage you described. Audrey Lynn has been a journalist and writer since 1974. Pythium causes young sedum roots to turn black. Some are doing beautifully while others are turning brown at the base and falling over. University of Illinois IPM: Sedum Stem Rot, Fine Gardening: Sedum Telephium "Matrona". Plants growing in poorly drained wet soil are most often affected. © Copyright 2020 Hearst Communications, Inc. Webinar She edited a weekly home-and-garden tabloid for her hometown newspaper and has regularly contributed to weekly and daily newspapers, as well as "Law and Order" magazine. Heavy soil and low areas that collect water will be more prone to root and crown rot problems. A Hambidge Fellow, Lynn studied English at Columbus State University. Not all sedum diseases may be treatable. Sedum Rot. Sedum stem rot, caused by the Colletotrichum fungus, can cause the lower stems of the plant to develop a covering of white mycelia -- branching fibers -- with tiny black setae (hairs) where spores collect. Chemicals such as fungicides and bactericides generally work only on certain pathogens. Register today Privacy Policy  | How to Get Rid of a Xanthomonas Leaf Spot on a Dieffenbachia, Virginia Cooperative Extension: Control of Ornamental Diseases, University of California at Davis IPM: Phytophthora Root and Crown Rot in the Garden, University of California at Davis IPM: Pythium Root Rot.  Register today Growing Herbs Indoors Webinar I can pull them out and there are no roots. Plant sedum in full sun and choose sedum species that are labeled disease-resistant. Feb. 24, 2021 The fungus spreads from infected plant debris around the sedum. Low Maintenance Gardening Flower types and bloom times vary depending on the species. Fungal spores often travel through splashing water caused by heavy rainfall, standing water (poor drainage), or overhead irrigation. The extremely hot and dry weather in summer can further stress the plant making it more susceptible to this disease. Jan. 20, 2021 Prevention If animals are eating your sedum, consider placing a cage or deer-resistant netting over your plant. This fungal disease causes the damage you described. Some are doing beautifully while others are turning brown at the base and falling over. Reduce watering to help the plant's roots dry and remove some of the soil at the crown if necessary to allow the area to dry more quickly. Growing Edibles Indoors Water the top 6 inches of soil, allow the top few inches of soil to dry, and water again. I can pull them out and there are no roots. The fungus may have moved into the planting bed during wet spring weather. Protectant fungicides may be applied, usually in early spring, to help prevent infections. Jan. 13, 2021 Site Map, Trees, Shrubs, Roses, Vines & Groundcovers, Puckered & Discolored Leaves from Peach Leaf Curl. Sedum is susceptible to crown rot if over-watered or if the soil doesn't have adequate drainage. Webinar Crown rot, sometimes called southern blight or southern stem rot, is caused by several soil-borne fungi. Overcrowding reduces air circulation that allows foliage to dry thoroughly after rainfall, promoting the spread of disease. University of California at Davis IPM: Bacterial Soft Rots, Leaf Spots, Blights, Wilts—Erwinia, Pseudomonas, Xanthomonas Spp. Remove mulch to allow the soil to dry. A definitive diagnosis of the diseased plant is often necessary to determine the most effective treatment method. Stem rot causes the sedum’s lower leaves to turn yellow and white, cotton-like growths of mycelium to appear around or near the crown on the soil. Avoid overhead watering. Long term problems such as poor drainage should be fixed or avoided before establishing beds. Most sedum types grow well to U.S. Department of Agriculture plant hardiness zone 9, though "Matrona" is hardy only to USDA zone 8. Sedum with Crown Rot. 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