I'm sorry to announce this: There is a bug with the flower when you hold over it and an enemy empire capture the asteroid to the flower, the flower must be attached to the tree!
(http://img7.imageshack.us/img7/7050/buuuugk.jpg)
The flower disappears as the enemy takes the asteroid over, after so, you'll have the "hover-over" effect from it on at all time, where ever your mouse pos is!