I have been trying a large number of Cypripedium species and hybrids for the last 40 years and currently am keeping about 20 alive or better. The one standout is my Cypripedium pubescens (Willd. Hort. Berol. 1: 13 (1804)) 'Vigrous', planted as a single growth rhizome from a Michigan wildflower nursery in 1985. It has steadily increased to about 70 flowering stems, some of which are double flowered. It is situated in open shade beneath tulip poplar trees. The soil is a neutral clay/loam without amendments. Companion plants include bloodroot (Sanguinaria canadensis), twin leaf (Jeffersonia diphylla), and great Solomon's seal (Polygonatum biflorum). I am preparing a new raised bed specifically for propagating this one for future distribution. This plant has never been bothered by deer or rabbit, presumably because of toxicity. It has thrived through decades of summers above 100°F, winters near 0°F, droughts, and hurricane rains.