Knapweeds are not readily eaten by livestock and compete with useful pastures, possibly with alleleopathic effects (whereby they produce chemicals to suppress the growth of other plants) that reduce the carrying capacity of the land.
Only one infestation of spotted knapweed has been known to occur in Australia in the ACT, which is now controlled.
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State Prohibited Weed
The plant must be eradicated from the land and that land must be kept free of the plant