Pull before they seed. Pull early and you will slowly make them mostly not an issue. Nutsedge has short roots and makes good rope to tie up your plants or herb bundles for easy transport. If you keep it from feeding and keep pulling you should be weed free...but I noticed in my area the "garden soil" I bought was full of nut sedge. I didn't make that mistake twice. I make my own soil now.
Another trick against weeds besides pulling early is to out compete them with things you want. Check out the intro in this YouTube video on just how dense I'm talking and tell me if you can find a weed in there. I had started plantingit between snows and filled it in so by the time weeds thought about germinating, they were already a step behind. I then pull as I see them.