The good news is that you're in the right place. The bad news is that there's some sort of bug connected to this. In some games the flower turns up at approximately midnight when the party first goes there, whereas in other games, the party has to wait until midnight of the night of the full moon for it to show.No promises, but try that.
TTBOMK, nobody knows why this happens, and the same player replaying MM7 with the same program on the same equipment can get different results in in different games. Now you know as much as I do. If it helps, (and don't suppose it does) I played MM7 on the Light Path, and again on the Dark Path, and the flower turned up in the same place and the same way each time
