Is you post a photo of a plant to a forum, then yes, someone else can come and specify which plant that is and link it into the database where it will also appear.
If that happens, the proposal goes through moderation just like any other image upload.
Also, once approved, then you are indeed notified that it's happened. If you didn't want it to happen, you can go in there and get it removed by clicking on "Delete this image" in the database.
Finally, if you are uncomfortable with it being available, I can disable it on a member by member basis. Two ATP members have this setup where nobody can import their photos from the forums into the database.
