I love fall crocus. Unfortunately, they don't last very long. They do flop but I enjoy them while they're still standing. Mixing them in with ground covers and other low growing plants gives a very nice affect.

By autumn crocus do you mean colcheums or true crocus? I grow both and enjoy the color they add to the fall garden.

They are true crocus, I have more just poking out in other parts of the garden (I put them in late). What ground covers and low growing plants would you recommend?

There are many fall crocus and no all of them flop. I have crocus cartwrightianus which is just finishing blooming and it doesn't flop. I have others that flop and I don't know which ones they are. I planted them years ago and have lost the labels. I also have safron crocus. They hold up fairly well because the foliage comes up with the bloom.

Check out the question about saffron crocus blooming; follow the link in the answer and you will learn alot about the various fall crocus.