Immigrant species

I've been following the discussion on pseudacorus. It seems to me that it is no problem except where it gets into streams, watersheds and wetlands, but that is true of lythrum too. If they are as hard to kill as some are saying pseudacorus is, it certainly is a problem, but it seems the plant police want to keep out all immigrants. Where would our gardens be without them? None of the bearded iris are native, but they have not become invasive. Or peonies. Or tulips. Or daffodils. On the other hand, aren't some of our natives invasive also? Certainly not all weeds are immigrants. Isn't there a definition of a weed as a plant out of place. It seems to me that we need to use some judgment here but, of course, too many of us lack that quality.  Reminds me of the time I brought home orchids from Taiwan, all properly inspected and all. The inspector said I should have a cyto certificate that they were not endangered species. Since they were carefully labeled as named species X named species and obviously hybrids, I had to bite my tongue to keep from telling the inspector he was an idiot and didn't know what a species was, but he llet me keep my orchids anyway. Later I realized that the phyto certificate even included a cyto certificate. My setosa Sylvanshine is blooming and a mighty pretty sight it is.         Joan Cooper, Roseville, Minnesota
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