Weed ID needed: tall leafy weed
Another stupid ass weed to waste my valuable time...
This one is tall-ish and grows quickly to about two feet. It pops up everywhere in my yard and doesn't seem linked together by the root so I'm not sure how it spreads. It's got a weak stem that hollows out as it dries and makes it hard to pull up the root. The leaves are pale green, and look like lettuce. I have not been able to ID it. Suggestions? Ideas how to stop it? Ideas how it got in my soil in the first place? Thanks!!
Here is a link that might be useful: