The ragwort law on the Isle of Man is The Weeds Act 1957. Although it precedes the law on the mainland of Great Britain it is based on the same original 1920 British Act which the mainland law is based on. Like the British law it does not oblige people to control ragwort but merely provides for the imposition of a control order. Without such an order there is no requirement for anyone to perform any control tasks.

This is what the relevant text of the legislation actually says:-

"If the Department is satisfied that there are injurious weeds growing upon any land, it may at any time serve upon the occupier of the land a notice in writing requiring the occupier to cut down or destroy the weeds within the time specified in the notice"

Later it provides a list of the weeds.

"Spear Thistle (Cirsium vulgare)
Creeping or Field Thistle (Cirsium arvense)
Curled Dock (Rumex crispus L.)
Broad-leaved Dock (Rumex obtusifolius L.)
Ragwort (Cushag) (Senecio jacobaea L.)"

It is, therefore, abundantly clear from the text of this law that there is no automatic obligation placed on anyone to control the plant.