I use Graze-on 90. I'm pretty sure it's supposed to do ragwort. We haven't got much, but I spray any that I see when I'm doing the nettles.
I use Graze on 90 too, but remember to keep horses off till it has died down and rotted well away. I prefer to rag fork them out, that way you don't have to keep the horses off.
I use Barrier H on early rosettes and fork out larger plants. After six years have just about got on top of it.
Graze-on 90 is a good general weed killer, but beware of what happens to any poo for the next twelve months.
Ragtime is an excellent ragwort specific (but kills other things) killer.
I've only tried Roundup and Barrier H. Of these, the Roundup was too difficult to keep to just the ragwort and killed off the whole patch. The Barrier H did a really good job.
I've got some selective herbicide as well and will spray pretty much the whole field during the spring, so hopefully that will kill some off too
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I bought two rag forks instead That way we get a good workout at the same time
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I've used: Grazon 90- didn't work
Ragtime - didn't work
Barrier H - Worked a bit but not much!
The ragwort was really bad though. Maybe I am just using them wrong?
I had my field sprayed but it didn't work -don't know what they used. I wasn't charged in the end.
I have a ragfork & use it, but I find that any tiny bits of root left behind just grow back again. Also, the problem became too large for just me & one ragfork!
Am going to have it sprayed again this year by someone else. I'm told the best time to do it is in April when actively growing.
Tescos own brand weed killer. The green bottle with the black trigger spray.
Just chop the heads off and then spray. The weed killer seeps down into the root and it never comes back. Plus its animal and child friendly.
Cheap and cheerful - and it works!