Impatiens Downy Mildew is a newer disease for Minnesota gardeners. It was first observed in 2011 and has since become a widespread issue across the country. It is caused by a water mold called Plasmopara obducens.
At first you may notice a slight yellowing or yellow stippling of the leaves, with a drooping appearance of the leaves, as if the plants need
to be watered. You may also see a soft, white growth on the lower surface of the leaves. Next, the blossoms and then the leaves fall off, leaving bare green stems. Finally, stems collapse and the plant dies.
While it is hard to replicate the colorfulness and beauty of Impatiens for shade, you have many other plant options that are not susceptible to downy mildew, including perennials.
Below is a list of some annual bedding plants that we carry here at Untiedt’s.
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