There's no doubt, it does exactly what it says on the label.
Day lilies, or Hemerocallis to call the genus by its proper name.
This group of plants produce flowers, each one only lasting a day. Now, I've grown rather fond of them and have a few, (courtesy of www.polliesdaylilies.co.uk ) and I thought it might be interesting to take some pictures of one flower over a 24 hour period:
It makes for a nice set of pictures, particularly as this flower was the last one for this year on the (new to me) variety 'Sunset Lagoon', so it made the recording of it a little special.
When I first started chatting with Pollie over Twitter (@pollieslilies) she warned me to be careful, that growing Hemerocallis was addictive.
She was exactly right!