'Key West' was bred and registered in 1999 by Olga Petryszyn of Valparaiso, Indiana. It is the result of a cross between Hosta nigrescens 'Elatior' and Hosta 'High Noon' and is a member of the breeder's Americana series. 'Key West' forms a large, upright mound of gold, heart-shaped, slightly rippled leaves that are 11 in. wide by 15 in. long. They have 14 to 15 pairs of veins and are slightly shiny on top and dull underneath. The pale lavender flowers are tubular, 1 1/2 in. long and mature into a greenish yellow seed pod. It grows 2 to 3 ft. tall and 4 to 6 ft. wide. 'Key West' will become a brighter gold when grown in bright filtered shade.