Grab all the stems at the bottom together and tug hard. Conyza isn't difficult to pull in my soil since it has relatively shallow fibrous roots. Do it soon, and bag and trash the tops where it has started going to seed as it is truly prolific in seed production, and they drift around like dandelion seeds.

I don't mind these as a weed, they're usually pretty easy to pull and get rid of and only spread by seed. I've only ever called it horseweed, and I think it has the distinction of being one of the first weeds to develop resistance to roundup products. Kind of like a plant version of antibiotic resistant bacteria.

Thanks everyone. Gone and bagged!

I actually know it as fleabane, but I've never seen it so huge.

Roundup resistant, huh. Monsanto are idiots (apparently, they are anti-evolutionists).

Regarding possible roundup resistance, the plant with the resistance is horsetail or mares tail, ie Equisetum hyemale, not horse weed, Conyza canadensis. In fact Equisetum is resistant to pretty much any herbicide simply due to its structure. Common name confusion strikes again.

Thanks for the clarification. This is why I normally use Latin when talking plants. Too many similar common names.

Floral_UK, I was under the impression that some other weed strains have developed a resistance to round-up since GMO seeds are marketed as Roundup resistant themselves, there by encouraging farmers to use much heavier concentrations of this pesticide than they normally would.