I live in North York. In the summer my purple lace died in the front of my house due most likely to verticillium wilt per you when I phoned. The plant was removed roots and all. I need to get something to fill the space and I want to put a Dwarf Burning Bush or spread Cosmos annual seeds. Both these are not listed as susceptible or resistant to verticillium wilt on the lists I found on google. Does this mean they are both o.k. I was told back in 2019 I could plant resistant plants and after several years the disease in the soil would disappear due to having no host plant. Take care and be safe during this horrible disease of Covid-19. Thanks.
Thank you for contacting Toronto Master Gardeners about your experience with Verticillium Wilt.
We have searched for information regarding the immunity of Dwarf Burning Bush, Euonymous alatus but have not found credible information to support its immunity to Verticillium Wilt. Searching for a colourful immune replacement, the University of Maryland extension division provides a partial list of resistant shrubs including dogwood, firethorn, flowering quince, holly, and rhododendron. https://extension.umd.edu/hgic/topics/verticillium-wilt
Should you wish to have a go with a Dwarf Burning Bush, two cultivars may fit your size requirement: ‘Rudy Haag’ is a slow growing small form—5 ft tall/10 years, and ‘Compactus may grow 10 ft. (3 m) (1.5 m) tall over many years. Canadian zones 5 to 8 any soil type, and fertilize in early spring.
We have failed to find useful information on the immunity of the annual Cosmos grown from seed.
We wish you well in your quest to find a colourful replacement for your lost shrub.