is onion weed poisonous
Killing Onion Weed. Onion Weed is a persistent, perennial bulb-type weed. Easily detected by the pungent onion-like odour that it gives off, especially after mowing, it is a cosmopolitan weed the bane of gardenersâ lives all over the world.One of the most difficult weeds to eradicate, it can in some cases be near impossible to completely kill Onion Weed.asily detected by the pungent onion-like odour that it gives off, especially after mowing, it is a cosmopolitan weed the bane of gardenersâ lives all over the world. One of the most difficult weeds to eradicate, it can in some cases be near impossible to completely kill Onion Weed.