When Do I Apply Broadleaf Weed Herbicide?

Apply broadleaf weed herbicide to actively growing weeds on a clear, calm day to avoid potential over spray on ornamental plants. For long-lasting results, fall application attacks weeds as the plant stores energy for the winter. Herbicides work best in temperatures between 50 and 85 degrees F.

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About this Author

S.F. Heron is an avid gardener with three years of experience in online writing and a working background in aviation and earth and ocean sciences. She is published on various sites, including Helium, eHow and Xomba. She holds a Bachelor of Science degree in journalism from the University of Maryland.