Brian, P. graminifolia is reputed to be hardy here but I've never tried it. Mine are in pots and very easy to grow, the biggest danger is too much water and thence rot. After they've flowered they'll stay in growth for a long time then just go to sleep with the fall. At this point I put the pot in the greenhouse and don't give them a drop of water until spring rolls around again. They are happy bone dry in the pot. If you knock them out be prepared to play hunt the tuber - they are like many Orchis that gather a coating of whatever medium they are in that very effectively camouflages them. Treat them like a pot of Rhodohypoxis. Best, J. John T Lonsdale PhD 407 Edgewood Drive, Exton, Pennsylvania 19341, USA Home: 610 594 9232 Cell: 484 678 9856 Fax: 801 327 1266 Visit "Edgewood" - The Lonsdale Garden at http://www.edgewoodgardens.net/ USDA Zone 6b