Black-Eyed Susan Concern

At the end of the season last summer here in St. Paul, Minnesota, I noticed a large quantity of black powder at the base of my 4 ft x 3 ft patch of blacked-eyed Susan plants. It looked as though black ‘coal dust’ had been laced throughout the patch, from the ground and up about 8 inches. Any ideas what would cause this and how would I keep it from happening again? They are planted in the middle of a 20 x 10 foot garden, receive a lot of sun, are planted in black dirt, and the garden has cedar chips sprinkled on top of the dirt.

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1 Comment To "Black-Eyed Susan Concern"

#1 Comment By Nikki On 03/20/2011 @ 12:48 pm

That is called sooty mold. This article will help you in case it comes back:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm ^[1]

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