Posted: 05/02/2016 at 15:59
The pods changes to a darker brown when the seeds are ripe. Easy enough to tell, gently squeeze a pod, if it splits then the seeds is ready. You need to be vigilant or the ants will take them away pretty quickly.
Fresh seed germinates better than stored. I tend these days just to spread the seed on a convenient patch of gravel and dig up the corms when they are a decent size.
However you may sow them in normal potting compost, cover with grit and place somewhere at about 16c. Germination ought to take place fairly rapidly. Do not prick out the babies until the corms are about half an inch across.
There is no guarantee that you will get white ones though.