Nurseries also often object to discontinuing the sale of invasives because they don't believe invasive plants are actually a problem, on a number of counts. One argument is that invasive plants only invade disturbed areas, so they are actually a benefit to ecosystems that are damaged by human activity. This argument is false on two counts. First is that even though invasive plants invade disturbed areas in many cases, they are still displacing native vegetation and disturbing natural ecosystem processes. Secondly, invasive plants do not only invade distrubed areas.
Invasion is a natural process, but it is no longer occurring on a natural scale.
This too is true, but it is not a valid argument against invasive policies. Nurseries have also been opposed to policies that restrict their plant sales because they feel that they are bad for the industry - this is not the case, as long as the nurseries are willing to capitalize on the new opportunities created by plant restriction for new, alternative plants. The last argument against invasive plants policies is that some gardeners and nurseries feel that invasive plants can be planted responsibly. This is true up to a point. Some plants simply cannot be planted responsibly.