"Diane" wrote in message
...
http://old-homes.net/pix/ours/flowers03/IM002431.jpg

The leaves are smooth while my astillbe leaves are notched. But they
almost look like astillbe's and are in the area where I have two.

If the above link is to the pictures of weeds in question, I don't think
they look anything like astillbe. Coincidentally, I am plagued with this
same weed here (SW Ohio) and it is among a big patch of mature astilbe that
are just starting to bloom. That weed has spread to the lawn and is
relentless. I have pulled and pulled and it still comes back. Preen
doesn't seem to prevent it.