Hi Kathleen:
".........growing in the same hardiness zone you garden in, be very wary
> of introducing it to your garden. Colder zones might be safe........."
That's right, but plants can show a surprising adaptability. Here in Argentina, Iris pseudacorus, atlhough not a bualb, a cold climate species, has invaded the subtropical wetlands where it chokes all other forms of vegetation with a mat of rhizomes and is moving south into cooler regions. Besides fulminant vegetative reproduction it sets plenty of corky seed that floats around and with the rains sail away to anchor in new locations to be colonized. Catastrophic.
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