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That is a large range, but asking how much weed seeds costs is a lot like asking how long a piece of string is. If it becomes problematic, apply a post-emergent herbicide in the fall. , Portulaca oleracea L.  Source: [url=https://acmeawards.com/7-cfr-В§-201-16-noxious-weed-seeds-electronic-code-of-federal-laws-e-cfr-lii-authorized-info-institute/]https://acmeawards.com/7-cfr-В§-201-16-noxious-weed-seeds-electronic-code-of-federal-laws-e-cfr-lii-authorized-info-institute/[/url]