Name: Carol Santa Ana, ca Sunset zone 22, USDA zone 10 A.
You need to remove the grass from the bed manually and create an edge to keep it from coming back. I doubt there is room for any bulbs among those daylilies. They should start blooming soon, and you might like them.
Thanks everyone. I actually want the grass that's pictured. I have about a 3 ft gap where it's not growing. I just wasn't sure if the grass would come in from the lily bulbs or if it was something that was planted additionally as "filler".