Noxious weed
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A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is harmful to agricultural or horticultural crops, nat
A mature cotton thistle, an invasive weed in Australia
The alga Caulerpa taxifolia is a noxious marine weed nicknamed killer algae. This is a picture of it invading a native plant bed.
This is a parasitic noxious weed, Striga gesnerioides, the cowpea witchweed.
This is a terrestrial noxious weed, Drymaria arenarioides commonly called Lightning weed. It is sometimes confused with daisies.
Jacobaea vulgaris
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Jacobaea vulgaris, synonym Senecio jacobaea, is a very common wild flower in the family Asteraceae that is native to northern Eurasia, usually in dry, open places, and has also been widely distributed
Noxious weed
…shipments of feed and crop seeds, or have been intentionally introduced as ornamental plants for horticultural use. Some "noxious weeds", such as ragwort, produce copious amounts of nectar, which is valuable for the survival of bees and other pollinators, as well as providing larval host foods and habitats…
Illustration Senecio jacobaea
Drone fly on ragwort
Jacobaea vulgaris
Blooming ragwort located in Glen Coe in the Highlands of Scotland