When you go to Home Depot and see these lovely Purple Coneflowers, your first inclination is to buy them and plant them for all the butterflies and bees in the neighborhood. Unfortunately, these plants are filled with Neonicotinoids which are insecticides which would kill any visiting butterflies and bees.
While Home Depot does label these plants, the label is hidden behind the larger identification label. Most people would probably not even see the insecticide label.
I’d like to suggest that you not only don’t buy these type of plants, but that you contact Home Depot and tell them to stop selling these types of plants with insecticides.
In this post on the Home Depot website, they say that they will stop using neonics by the end of 2018.