I
think they are listed until something else comes and bumps it off. Since there is space for only 9 at a time, they sometimes move pretty fast, especially when some of the gals are posting images courtesy of a nursery. Dave will let us know if this is the case.
You should know that I was ooooohhhh-ing over one of your images yesterday of a Gerbera Daisy!
You really have some great shots!