How to keep centipede grass out of garden beds?

This is what it looks like when it looks nice. But every year the centipede grass creeps into my garden beds, and it gets more and more out of control every year.

I’ve tried using an edger around the border going down into the ground a few inches. And getting down on my hands and knees to pull all of the runners out of the ground is becoming such a huge job. I end up having to completely renovate this area every spring, and by the end of the year it still ends up being totally taken over by the centipede runners. I’ve even tried spraying Grass-B-Gone and it only slightly works.

How can I keep the centipede grass out of this area for good?

Alabama