Officials in New Hampshire are currently at odds with the nursery industry over a proposal to ban the sale and transport of 18 invasive plants and 15 insects, as reported by the Concord Monitor. Among the disputed plants on the list are the Norway maple (Acer platanoides) and Japanese barberry (Berberis thunbergii), two established invaders that have been big moneymakers for some nurseries. You can go here to read .pdf versions of the current NH invasive species laws, proposed rules, and proposed lists of invasive and potentially invasive species.