Well firstly it's an open secret, especially amongst the orcs. Your capital would be a perfect breeding ground for the flowers 

Also the demon army is much smaller than the others. They are also cripples by the fact that the nation needs demons to function. They use their magic to direct rain flow and turn fields. Almost half the demons are stationed at desk jobs or climate control.

Because of this I needed a way to keep the demons on equal footing. So small bit tough