Ants in the greenhouse

[1greenthumb]

Hello to all,
1st post and new member here from Va. Short & sweet, in my small greenhouse I have an ongoing ant problem. I have tried insectcidal soap spray, ant traps and removing the affected plant and repotting it outside the greenhouse. I still have the ants returning to a different pot or sometime the same pot that was previously affected. In the greenhouse are 3 Phal., 2 Den., 1 Cat. (mounted on wood),1 very large epidendrum & 1 ??? along with some houseplants, cacti, & live spanish moss. During the cold weather months the ants are more active. I was thinking possibly a carniverous plant like a venus fly trap or maybe some praying mantis' Any one have any thoughts?