So I've already searched google and other sources for information on how to get rid of the Unfinished Room Moodlet but the problem is most people suggest that if you have "Into the Future" that your supposed to put down special floor tiles to plant on...I do not have "Into the Future" (Yet) so this is a problem for me.
The steps I've already taken are:
I built the room, Wallpapered it inside and out. Put Floor Tiles on the roof and then the Glass roof. Windows and doors. Then I used the dirt paint tool to paint the inside completely with dirt. However I'm still getting this moodlet. I have the Stones Throw Venue in the world and when my sims go there...no moodlet...Only at the home lot.
EDIT: I also have a light in the Greenhouse. Also I have to have "moveobjects on" in order to plant anything.