Coneflower Plants
Q.

outdoor flowers

kshover added on August 23, 2016 | Answered

Planted coneflowers outdoors and they started to turn black. Sprinkled with Sevin dust and they continued to die. Pulled stalk out and no roots. Will they come back next year or are they dead? What was the problem - bugs or disease?

A.
A.Answers to this queston: Add Answer
Alisma
Certified GKH Gardening Expert
Answered on August 24, 2016

If the coneflowers started to turn black soon after they were transplanted, they probably died either of transplant shock or of overwatering:

https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

If instead they flowered and then dried out, this is normal and just due to the lifespan of the flowers.

Also check whether any of these possibilities match, especially sweet potato whitefly:

https://www.gardeningknowhow.com/ornamental/flowers/coneflower/coneflower-problems.htm

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