Posted: 16/10/2015 at 13:47
All I ever do is to take the seeds (need fresh ones by the way) and scatter them on the gravel garden. Don't be in too big a hurry to prick them out when they germinate either. When I grew them in seed trays I often left them until the corms were a good inch across and distorting the pot!
If you do buy seeds, soak them in warm soapy water overnight before sowing. They need darkness as said and a constant temp of 16c.
If you lived near me you could come and help yourself to plants, they are getting to be weeds!