Keep it mowed and it wont go to seed and will eventually not survive.

Better yet, don't mow, let it go to seed and pick the seeds this Fall. Soak the seeds for 5 days, then spread them out on the floor and let them dry. Keep turning them. After 5 days, put them in the oven and slowly raise the temp to eventually over 120 degrees over a few days. Remove them and mash them up. Place them in warm water for a couple more days. Drain the liquid off and set the seeds aside. Place the liquid in a jug with some yeast. Wait until it stops bubbling. Throw the seed waste on the lawn and drink the liquid. Both you and your lawn will be happier.

Guess there's a reason your username is ridge runner haha.

:)

tenacity... multiple applications over the next 6-8 weeks. all that crap will be dead.