Besides Z. elliottiana, there are two more species of yellow Zantedeschia: Z. pentlandii (in the trade, OK in containers) and Z. jucunda (spell?) (hard to grow even in containers). I would guess that Z. albomaculata and Z. rehmannii are the hardiest in cold climates. Z. 'Black Pearl' does very well outdoors in the ground on the east (protected) side of a greenhouse. It blooms every summer and increases. I don't know what it would do out in the open field. Z. aethiopica cvs. have not survived out in the open in the ground here in central Indiana, with the exception of Z. 'Green Goddess' which barely survives planted hard up against the foundation on the south side of a greenhouse. There are plenty of hybrids in all colors as well. Jim Shields in Westfield, Indiana USA ************************************************* Jim Shields USDA Zone 5 P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344