Deb, Thank you for your informative and thought provoking discussion. Some very good points made. I am organic, I do have a lot of natives, and I mix them with established garden plants. I don't use chemicals, so I am hacking out my invasives by hand, as you say, a slow process. I think that gardeners can be both concerned about native habitat and keyed in to growing specific plants; I am. I think it is alright to be certified, if that is your thing. I would rather concentrate on removing invasives; there are a lot of choices for replanting these areas, and not just with native plants. There are many garden plants that happily co-exist with native plants; my garden is proof of that.