Keep mulch no thicker than several inches and away from the base of the plants. http://extension.umd.edu/hgic/rhizoctonia-web-blight-flowersgroundcovers. We viewed your photos. Sounds like stem rot. Question From: Mason, Ohio, United States. Powdery mildew, root rot, blight, and rust can be treated with a fungicide. The one next to this one has started to turn brown also. Sounds like stem rot. Also watering three times a week sounds excessive. If there is overhead irrigation, plants will be more susceptible. Watered with irrigation system three times a week. Coreopsis do best in fast draining soil that is not overly rich. Badly infected coreopsis leaves become discolored and distorted, then drop off. 10 coreopsis Zagreb plants planted in May, 2017 did well until two weeks ago started to turn brown. They get ample sun with late afternoon shade. Best And Happy Yardening, Nancy. Dig into the soil to make sure thatthe soil is wet to a depth of six inches. Coreopsis do best in fast draining soil that is not overly rich. Remove all the dead material. These thrive on moist leaf surfaces and cause transparent to brown or black spots that disfigure the leaves. Coreopsis flowers may develop green or elongated petals. A bit of compost in spring is all the fertilizer they need. The plant came back this spring and appreaed healthy. No chemical control is recommended. This looks like Rhizoctonia web blight, a fungal disease. Best And Happy Yardening, Nancy. 10 coreopsis Zagreb plants planted in May, 2017 did well until two weeks ago started to turn brown. Irrigation during the first year is important. I have another bed of Coreopsis, these plants (so far) have not shown this problem. Any thoughts or recommendations? Soil that is dry beneath the surface means the plant has been underwatered. Last year one of my Coreopsis turned brown and appeared dead. Scab: Leaves have a coating of gray to brown spores. Coreopsis flowers may be annual or perennial and come in a variety of heights. mh. Bottom line, you may be killing it with kindness. Colors of petals include red, pink, white and yellow, many with dark brown or maroon centers, which makes an interesting contrast to the petals. It is now turning brown again. White fungal webbing forms around the base of the plant, and the leaves and blossoms turn brown as they wilt and die. Various leaf spots are also caused by fungi. … The like to run on the dry side. Mildew rarely affects coreopsis until after the first flowering. Apply a fungicide to protect plants. http://extension.umd.edu/hgic/rhizoctonia-web-blight-flowersgroundcoversAt this point you can prune out the blighted areas. Watered with irrigation system three times a week. The like to run on the dry side. Infrequent, deep irrigation is better than frequent shallow irrigation, which only encourages shallow roots and will encourage weed growth.Check the soil moisture at least once a week. The root system should be okay. Leaves and flowers turning brown can be a result of improper watering. It can also cause root rots and stem cankers. They are in a mulched bed with good drainage. Provide plenty of spacing for good air circulation. Coreopsis can suffer from crown rot (Sclerotium fungus), root rot (Rhizoctonia fungus) and stem rot (Alternaria, Rhizoctonia or Sclerotinia fungi). The Sclerotium rolfsii fungus causes crown rot in coreopsis plantings. If you suspect wilt — your plants will wilt, turn brown, and die — remove infected plants. Ask an Expert is made up of groups and individual experts. They get ample sun with late afternoon shade. This is a dieback of foliage during hot humid conditions. They are in a mulched bed with good drainage. A bit of compost in spring is all the fertilizer they need. To prevent aster yellows, use diatomaceous earth or insecticidal soap to keep leafhoppers at bay. A member of the Asteraceae family, blooms of growing coreopsis are similar to those of the daisy. Remove all the dead material. Bottom line, you may be killing it with kindness.

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