Halosulfuron Pro Herbicide is meant more for nutsedge control in turf grass and it cannot be used near a vegetable garden or anything edible. It remains in the soil for up to 3 years so the manufacturer recommends that you not plant anything edible in an area where it has been applied for at least 3 years. For nutsedge control in or around a vegetable garden, it is recommended to spot treat the sedge with a glyphosate or RoundUp type product directly. With this type of product it is only necessary to wait 2-3 weeks after application to plant vegetables or anything else. We would recommend Roundup QuickPro 1.5 oz. packs for ease of use. Also, you should not just pull the plants. This will just split off the rhizome and more new plants will grow from the nutlets left in the soil. To completely remove the plants, you would need to completely dig out the nutlets so that new plants do not grow from them. Many folks will still till the soil after using RoundUp to be sure there are no remaining nutlets that will grow new plants.
Halosulfuron Pro Herbicide should be applied to established listed turf when temperatures are below 80 degrees for targeting actively growing listed weeds: Purple Nutsedge, Yellow Nutsedge, Kyllinga. It is not labeled for buckweed.
Unfortunately, Halosulfuron Pro Herbicide is not labeled for Johnsongrass and it has been replaced by ProSedge Herbicide, which is also only labeled for some broadleaf weeds and Nutsedge. Johnsongrass can be a nuisance and hard to get rid of, unfortunately, there is no chemical labeled for it in pastures. You can mow it as low as possible and/or apply a Glyphosate product such as Roundup Pro Concentrate to spot treat but even then you might only get suppression. We would also recommend contacting your local cooperative extension office and speak with a Master Gardener to check if they are aware of a successful product.