My prefix won't stand, but it cracks at the bottom.
My suffix has heads in the clouds, not forgotten.
My infix is land, but no flowers can blossom.
My body has legs in a shroud, then wings open.
What am I?
The answer is $9$ letters, and the title is a clue. For the last part, I can include the
knowledge tag... but as a hint, I won't — once you solve for the affixes, you will most likely know of the last line.