"There is a difference between a stolon that produces a rhizome, and a corm. Cheers, John E. Bryan" What about Crocus nudiflorus, which produces stolons and also mature corms. When does the stolon become a corm? 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