Jim: We've had Arum hygrophilum and Asarum nobilissimum (at least Zone 7b) both to 6 degrees F with no problem, so it would be interesting to try and push the zones further north. If I remember correctly, Jim Waddick told me that he grew Arum hygrophilum outdoors in Kansas City. Tony Avent Plant Delights Nursery @ Juniper Level Botanic Garden 9241 Sauls Road Raleigh, North Carolina 27603 USA Minimum Winter Temps 0-5 F Maximum Summer Temps 95-105F USDA Hardiness Zone 7b email tony@plantdelights.com website http://www.plantdelights.com/ phone 919 772-4794 fax 919 772-4752 "I consider every plant hardy until I have killed it myself...at least three times" - Avent -----Original Message----- From: pbs-bounces@lists.ibiblio.org [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Jim McKenney Sent: Tuesday, March 30, 2010 11:42 AM To: 'Pacific Bulb Society' Subject: [pbs] Arum hygrophilum, Asarum maximum and A. nobilissimum Arum hygrophilum is starting to bloom in one of the protected cold frames. Of the two color forms shown on the wiki, I think my plant will be like the one with less white on the inside of the spathe. Also beginning to bloom are Asarum maximum and A. nobilissimum. I have two forms of A. nobilissimum. One has a bright white streak on the petals, somewhat like the big white patch on A. maximum. This one and A. maximum are in bloom today. The third plant, the other A. nobilissimum, is not yet open. I have two forms of A. maximum also. The one here for years has no cultivar name that I am aware of; and I recently acquired a plant of the cultivar 'Ling Ling', but this has not yet bloomed. It looks like a tissue culture plant. If you know only the native A. canadense, you will be surprised when you see the flowers of these two species: they are big, several inches across. A. maximum is very striking. The form of A. nobilissimum without the white patch is something else - gross, suggesting suppurating tissue or like something out of an anatomy or pathology book. A. maximum might work as a garden plant here: years ago I saw it in an unprotected spot in a local public garden. That was a nice clump full of flowers. When I checked the site the next year, it was gone. Perhaps it died during the winter. On the other hand, these striking plants are probably potent thief magnets (and no, that is not how I acquired my plant). A. nobilissimum came with a zone 8 rating (I'm in zone 7), and it's been in a cold frame and growing well since arrival several years ago. I have a hunch that these asarums are a lot more sun tolerant than they are given credit for. Jim McKenney jimmckenney@jimmckenney.com Montgomery County, Maryland, USA, 39.03871º North, 77.09829º West, USDA zone 7, where temperatures over 80 degrees F (~27 degrees C) are predicted for the weekend. My Virtual Maryland Garden http://www.jimmckenney.com/ BLOG! http://mcwort.blogspot.com/ Webmaster Potomac Valley Chapter, NARGS Editor PVC Bulletin http://www.pvcnargs.org/ Webmaster Potomac Lily Society http://www.potomaclilysociety.org/