Someone thought it might be a nut sedge. Here is a rhyme for you to be
sure.
Sedges have edges, rushes are round.
Nut sedges are sorta triangular and have edges. Pick a leaf and feel the
leaf to see if it has any edges. If it does you will see what I mean
right away.
You should try to pull up as much of a plant as you can and take it to
your local greenhouse or garden center and ask for help. Don't go to a
department store. They don't know what they are doing there!
A prety sugestion for you to do could be to pull out all you can then
plant creeping tyme.It does'nt mind being walked on and looks/smells
good. Also, if your patio is shaded you could grow moss in the cracks.
Collect some moss in the woods thats on rocks and break it apart into
little pieces. Get some whole milk and let it get real sour. Mix the
moss and sour milk in the milk jug and shake real good. I like to let it
set over night. In the morning pour the mixture in a pail and paint it
in the cracks being sure you get moss in the cracks. Some people say to
put the mix in the blender but I don't.
Once a month or so feed your moss sour whole milk till you see it
growing. It really looks nice once it gets growing.
The sour milk does smell.
Hope I helped.
Eddie