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

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