Barna: Winter hardiness of plants can vary by as much as 20 degrees F, based on the amount of summer heat they receive or don't receive. In other words, if a warm climate plant would survive -10 degrees F in a hot summer climate, it will likely not survive lower than +10 degree F in a cool summer climate...hence the reason for the discrepancies in hardiness ratings. 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 Barna Sipos Sent: Friday, November 30, 2012 5:11 PM To: Pacific Bulb Society Subject: [pbs] Lycoris Cold Hardiness Hi All, I tried to find some more exact information about the cold hardiness of some Lycoris species, but every webpage says something different. (somewhere the L sprengeri hardy to USDA zone 6 but the other page is warning: "do need to be brought indoors for the winter" in the UK.) Has anybody got information about these plants? Which one is reliably frost hardy at which USDA zone? I would be interested mainly the species listed below. L albiflora L aurea L caldwellii L chinensis L haywardii L houdysellii L longituba L radiata L rosaea L sanguinea L sprengeri L traubii Many Thanks, Barna Sipos Hungary, UK