Get rid of the weed by pulling it from your garden, or use a commercial herbicide. Your healthy seedling should root in quickly and grow like a weed during the veg growth stage. You can usually opt to buy either a single seed or packs of three, five, ten, or more.  Source: <a href=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/</a>