WOW! Those are some big pictures. I get the point though. You have nutsedge - I would know for sure if I could see a seed head, though. Knock it out with sedgehammer.

That stuff takes over fast doesn't it?

Next time you link to a photo, if you can resize it down to 800x600 it makes reading the forum easier.

Simply use this syntax in the tag after the "src".

style="max-height:600px; max-width:800px;"

I know this post is very old, but thank you for the photos and the question. My yard is full of this stuff and I came searching to find what it is and how to get rid of it. Glad I found your post!