Assertion: ragwort | /r/HasProperty | established
Facets:
Source sentences:
text: As ragwort can be a major problem in dairy pastures once it is established, it has been declared as a noxious weed in most parts of New Zealand for many years, forcing farmers to control it.
text: In areas where ragwort has been established, periodic re-treatment will be necessary, as pulling can cause disturbances and allow seed germination.