Pesticides are the main control measure used against many insect pests in greenhouse floriculture and their toxicity to natural enemies impedes the use of biological control. Trap plants can be a useful control strategy for ornamental IPM programs. This strategy is well known in field crops, but their use in greenhouses is relatively new and little research has been done in floriculture. Trap plants must be more attractive to a particular insect pest than the main crop and concentrate the pest in a localized site where it can be effectively controlled, either biologically or chemically. Keeping the crop pesticide free for the majority of the production period opens up the possibility to use biological control agents against greenhouse pests. The trap crop can even act as a banker plant and assist in the build up of natural enemies. The multiple challenges to make the trap plant strategy work in the greenhouse include finding the right trap plant species and a good understanding of the behavioral ecology of the target pest to determine optimal trap plant placement and number. Presently, research is done on flowering chrysanthemum as a trap plant for western flower thrips in potted chrysanthemum production when the plants are in the non-flowering stage. In addition, growers are using greenhouse tomato as a trap/banker plant for whitefly control in poinsettia production.