Weedkiller

strtdv

It's safe if you take precautions, which if you're spraying it definitely involves breathing equipment. In a watering can then gloves and "don't get it in your eyes" is all that's needed.

It is nasty though, it's an organophosphate and poisoning is very unpleasant. All the cases I've seen have been deliberate, but we're unpleasant for all involved and one was fatal.
It's not nearly as bad as paraquat, but you can't buy that anymore

SteveRobinson

strtdv said: but

Glyphosate based weedkiller will kill most weeds. Won't touch mare's tail though, you need some stuff that you can't buy as weedkiller anymore but you can still buy as a compost additive, can't remember the name of it off the top of my head.

Also, nothing really kills Japanese Knotweed (although injecting with glyphosate is the most effective method)

I set back the horsetail for a few years by injecting neat Gallup but it's back now. Just hoeing it off for now but will try Gallup again later in the season.

rsvmark

Also depends on location. Gallup 360 is nuclear territory. But it will kill grass. Barclay Holster XL is an excellent selective herbicide for use on lawns

pintspiller

Lay cardboard down and top it up with compost or wood chippings