71 participants responded to Q21. The great majority (58/71, 82%) of them felt that scientific proof of invasiveness would convince them to stop selling invasive plant varieties. In testimony of the importance of this option to the respondents, one wrote, “some [people] feel that all exotic species are invasive and I would not want to see good use of exotics stopped by some “native” loving person or group without good, scientific work on the species, sites, and uses of the species in question.”

50/71 (70%) indicated the importance of knowing that nursery industry members were involved in deciding invasiveness, which is a sentiment that has been repeated elsewhere in the survey. 46/71 (65%) said that government prohibition of some plants would persuade them. In response to this option, one respondent wrote in the margins “do not let government dictate.”

Certification (19/71, 27%), customer requests (25/71, 35%), and plant group requests (22/71, 31%), were considered persuasive by far fewer respondents and were only chosen in addition to at least two other options. Knowing other nurseries were doing the same thing (26/71, 37%) was also less popular, though one respondent did feel it would be the only thing to persuade them to stop selling invasive plants.

In the other category, one person wrote “knowing that it is my responsibility to make this world (my small part of it) more like what God intended it to be.” Another said wrote “our own research and observation,” and a third said “the proof that a plant cannot be contained by other means.”