It's nice to know, courtesy of the Crocus website (where pots are reduced by 30% because they are now in full flower and will not last much longer), about the origins of scylla: 'Dainty spikes of up to five nodding, bell-shaped, violet-blue flowers in March and April and slender, strap-shaped, glossy, mid-green leaves... They originate from the area around the Black Sea so they are extremely robust.'