Posted: 30/08/2014 at 15:47
Its mostly down to two things depth of planting and when they were planted.
Saffron crocus require a deeper depth than the standard crocus if you are going to succeed with producing any flowers they need to be planted a good 6 inches deep.
Also they need time to establish in the ground before putting out flowers. Planting in autumn normally results in no flowers that year but you should get some the flowing year.