I'm a new home owner and have around .75 acres. My understanding is grass is st. Augustine and the lawn has been neglected for years but there is still some good covering. I am wanting to try and revive it without the need to sod the entire yard. My question is what is this "weed" which seems to have infested the entire yard and can it be killed? It seems to almost be shrub like in nature and the stems are very hard, spidery and difficult to pull out. It is not like a clover. See pics....looking for suggestions on how to clean this mess up. I've been coming home at night and taking a 3 foot square area and pulling by hand!