Seeking advice for growing N. willkommii

Greetings,

I planted willkommii in my garden several years ago and get only leaves and no flowers.
I garden in NW New Jersey, zone 6. The bulbs are in an plot where other daffs are very happy.
I have replanted them once, thinking perhaps they were too deep the first time. Still no flowers several years after replanting.
Any thoughts on how to encourage blooms?

Thanks very much,
vicki

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