Will weed killer kill stickers that are already mature and brown and keep them from coming back next year?
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Answers:
The best way to insure that stickers don't come back next year is to keep your yard mowed. Keep it cut as short as you can (without burning it up) the rest of this mowing season, then start with a good scalping next spring. Keep it mowed short until you see that the stickers are gone, then raise the lawn mower a notch or two. I've always done this and have not had stickers more than a few weeks at any of the homes I've lived in over the last 30 years, then they're gone for good.
Not sure about your "stickers" Glyphosate will kill about all your weeds, spray every time it begins to look healthy. Also, there is a selective herbicide for about every weed these days, but no lifetime kill product. Count on spraying Roundup, for an example, at least 4 times a year, in your described situation.
You have to keep your yard mowed so the stickers can't go to seed. Every sticker is one more seed. Poison won't kill the seed. You have to use weed preventative early in the season and mow often. You'll eventually kill them out.
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