Judy: I have ordered and grown Tigridias from Dutch sources and never had any overwinter here in NC. Conversely, those that we grew from wild collected seed from Yucca Do (5000' elevation in Mexico) have grown and multiplied each year. These are all growing in the very same part of our rock garden. Tony Avent Plant Delights Nursery @ Juniper Level Botanic Garden 9241 Sauls Road Raleigh, NC 27603 USA Minimum Winter Temps 0-5 F Maximum Summer Temps 95-105F USDA Hardiness Zone 7b email tony@plantdelights.com website http://www.plantdel.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