I assumed they were wild plants. Still lean toward Carex, though.
You can easily tell by the roots, or the foliage which from your pics don't look like daylily, but I can't be positive, then. But you could...
Daylilies always have what looks like opposite leaf arrangement on the individual stems. These are all pics of different daylilies showing this:
Carex does not do this, and often you can detect leaves growing in 3 ranks instead of 2. Sometimes you can role the stems between your fingers and feel a triangular (instead of round) stem, also.
