Thanks, Lin. I do have Persicaria around so that might be a possibility. These patches look like a seed pod or seed head dropped there and a bunch of the seeds germinated. The shoots/stems are not herbaceous though. They are stiff but not rigid. I can press them down without breaking and they spring back. That's about all I can tell at this point. I'm trying to decide what to do with these before the grass begins growing in earnest and these get too much bigger.
