Thank goodness I had read about the bad behavior of Allium triquetrum, because it was very pretty in the wild (in Spain) and tempting because it was flowering in considerable shade -- but I knew not to look for seeds! Allium unifolium behaves better for me here in western Oregon than it does for Mary Sue in coastal California, but it hasn't escaped its original spot, nor has European A. moly, sometimes considered invasive. The one that does get around here is A. carinatum ssp. pulchellum (Mark McD, correct me if that's not the currently accepted name), which produces "fireworks" flowerheads in late summer, in lavender or white. In a naturalistic garden such as mine (that is code for "messy"), it's a valuable plant because of its showy (good for cutting) flowers and unusual season of bloom, but I won't be taking it when I move to a smaller garden. It has little foliage and gets about 12 inches/30 cm tall on stiff stems, so it can be grown among other, low plants. Many years ago I got seed misidentified as A. campanulatum from the Robinetts' list and grew plants that have become a little over-enthusiastic. I believe they were tentatively identified a couple of years ago as A. membranaceum. The scapes are about 6 in/15 cm tall, and the relatively large inflorescence is pale pink; they make a mass of flowers in late June and also a mass of bulbs below ground. Another long-term survivor from that seed order is A. hyalinum, correctly identified in this case and by no means a pest, a tiny species happy in stiff, unirrigated soil. The real A. campanulatum is a treasure and comes in some excellent dark forms obtainable as seed from Ron Ratko. A pair of rather similar and excellent American species are A. pluricaule and A. falcifolium; I notice one (I think the former) coming up from a stray seed in a sand bed. A. amplectens, a showy pink American native, has seeded about in the bulb frame and should do all right outdoors. Because I spread discarded potting soil from the bulb collection on the garden, I get many surprises after a few years; I see both Fritillaria whittallii and F. messanensis blooming in the same sand bed, presumably from stray seeds, and even my beloved Anemone palmata producing its brilliant yellow flowers, albeit on stems shorter than it manages with a bit of protection. Jane McGary Northwestern Oregon, USA