I noticed that some people can adapt quite arrogant theories as to which plants are more desirable than others. Some say only native plants. But there are good arguments that hardly anything qualifies as native when the plant ecosystems have been so drastically modified by human populations. Some say only food (human or animal) providing plants. But, others really don't want animal pests hanging around their property. I tend to dislike highly hybridized or GMO plants.
I like your 3 functions rule, Dave.
