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Mark I would say they are gross feeders, we throw everything at them in large amounts! When I was a child Dad used to grow them on the compost heap!
Imperialis doesn't usually offset very much. Two stems for each original bulb suggests they have split and may be under a little stress. How deep have you planted them?
DirkThe gibbosa is a fantastic plant - better than anything I have seen in the wild.
and more,Fritillaria latifolia