I never used the Flora mod before so my advice can't exactly be useful to you, but I'll give it a try.
Deleting from "My Spore Creations" Folder: This is mostly my preferred guess since all creations you made lead to here. Try looking up the name of the plant you made, and remove from there. If you do, it should be gone from the game.
Ripper of Spore: Unofficial Galactic Score and... that's about it.
"Raggedy Ann scares me!"