A survey of Maine nursery and landscaping businesses showed that most respondents were concerned about invasive ornamental plants and tried to steer their customers towards buying non-invasive plants. Most would also support labeling of invasive ornamental plants or would not carry invasive plants. Interestingly, most were neutral about whether their customers were concerned about invasive plants.
Coats, V. C., L. B. Stack, and M. E. Rumpho. 2011. Maine nursery and landscape industry perspectives on invasive plant issues. Invasive Plant Science and Management 4:378-389.