Weeds with little purple flowers are speading in my Bermuda grass...making small clusters of little stickers..

what can i use to kill them without harming the grass? they are very thick and i have a large yard so i can't pull them or start over with a new lawn..

Weeds with little purple flowers are speading in my Bermuda grass...making small clusters of little stickers..
Is this crown vetch? Take a picture of it (or, better yet, a sample) to the local agricultural extension office. They can tell you what the weed is and the best product to kill it without damaging your yard. Without knowing the weed first, any answer is going to be a shot in the dark and may hurt your lawn without hurting the weed. Even Round-up doesn't necessarily kill all weeds!
Reply:go to your garden center,someone who sells FERTILOME


products,and get some weed and feed in the fall and broadcast your lawn,and they want be their next year and then do this every year.
Reply:they sound nice why dont you leave them for the wild life?
Reply:I have 40 acres of coastal Bermuda that I harvest for hay each year. There is an herbicide on the market called 24d that I have applied annually. You have to have an applicators license to apply it so you will have to hire someone to apply it for you. 24d will kill just about everything except the Bermuda grass.
Reply:Sounds like you have what we call goat heads, I would use Ortho Weed be gone or Roundup on them. Ortho is user and grass Friendly as to Roundup kills anything it comes in contact with.