Liriope spreading with "runners"

North Little Rock, AR

I'm trying to figure what would be the most effective way to to get rid of the "spicata" loriope that is bordering beds. Runners are spreading and coming up in azaleas and lots of other plants and will eventually take over. I want to replace it with the "muscari" or clumping form. If I spray it with round-up will it also kill the runners? I thought the blades for 'Big Blue' were wider but both varieties seem to look the smae. Is there a sure way to tell the difference? Thanks so much!!!

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