Yellow-stick, the ragwort or ragweed, which grows to a great size in Ireland.
Then there's this ragweed; if I let it alone, it will choke out every thing else.
If man could make but the single seed of the ragweed, he could make a world.
"Honestly, I didn't think it would kill anything but ragweed," Henry sniveled miserably.
Weed seeds such as those of spurges (Euphorbia), ...