The Quick Answer: Roundup® Extended Control products kill weeds and prevent new ones for up to four months - so you keep those weeds away longer.
Want a longer time without seeing weeds? Roundup Extended Control is what you'll need. Just spray the weeds, then spray the cracks. The weeds'll be gone and they won't be back. With extended control you apply just once, and it's adios weeds for up to four sweet months. TEXT: Always follow label directions.
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