Answer: You might want to try growing some of the more modern hybrid impatiens that tend to be less susceptible to wilt diseases. Once you have verticillium in the soil, it will remain there for a numnber of years. Avoid growing other wilt susceptible plants such as tomatoes, petunias and peppers. I'd rotate plantings, trying begonias, torenias or pansies in that location. Also, the seed saving could just be spreading the wilt to other areas. Consider growing these impatiens in a container with sterilized potting soil to see if they still have the symptoms. Then you'll know it's in the seed and you'll need to destroy the seed.
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