re: Common Lespedeza in yard

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Ive spot sprayed in the past and frequently throughout the summer with Ortho Weed Be Gone Would Celsius be more effective and prevent the need to spray throughout the summer?

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Celsius is a post-emergent herbicide so it’s not going to prevent weeds. Depending on what types of weeds you are trying to control, consider using a pre-emergent herbicide in late winter/early spring and fall, it won’t eliminate weeds but certainly helps control annual weeds and reduces, not eliminates, the need for spraying.