Ragwort law on the island of Jersey is made by the island's independent government. The piece of legislation concerned is Weeds (Jersey) Law 1961. It is essentially a copy of the mainland of Britain law the Weeds Act 1950 and its legislative effect is the same. An order may be made directing someone to prevent the weeds from spreading, but without receiving and order there is no obligation placed on any individual to do anything about the plants.

It states:-

The Minister, if satisfied that there are injurious weeds to which this Law applies growing upon any land, may cause to be served on the occupier of the land a notice in writing requiring him or her, within the time specified in the notice, to take such action as may be necessary to prevent the injurious weeds from spreading.

It then provides a list of weed species :- Spear thistle (cirsium vulgare (Savi) Ten.) (tcheurdron).
Creeping or field thistle (cirsium arvense (L.) Scop.) (tcheurdron).
Curled dock (rumex crispus L.) (doque corlée).
Broad-leaved dock (rumex obtusifolius L.) (doque).
Ragwort (senecio jacobaea L.) (entaillie).

But the government of the island are, at the time of writing, lying to their residents about the law that governs them. They say :-

"Ragwort is specified as an Injurious Weed under the Weeds (Jersey) Law 1961 which requires occupiers to prevent it from spreading.

Land occupier co-operation is required to control this weed and prevent it from maturing, seeding and ultimately spreading throughout the island. This is a legal requirement if you are the occupier of the land upon which the weed is growing."