Jane mentioned virused Crocus medius from Holland - I have mounted a picture on the wiki of this form, http://pacificbulbsociety.org/pbswiki/files/… and of the apparently clean form that a few are lucky to grow http://pacificbulbsociety.org/pbswiki/files/… In crocus virus is most likely to be seen through twisted, deformed or streaked flowers. Streaked flowers are usually slightly mis-shapen as in the medius illustrated. The leaves may not show any obvious sign of virus. Tony Goode. Norwich UK