Wilting blossoms on dahlias
Dahlias are susceptible to a couple vascular wilts---Fusarium wilt and Verticillium wilt. Both of these fungi can remain in the soil for many years, and there is no good fungicide treatment that will control them. Some varieties have more resistance than others, so growing the most resistant types may help. Otherwise, grow your dahlias in a spot where none have grown for several years, or grow them in a container.
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