Arum Italicum will not grow

Eutaw, AL(Zone 8a)

Three years ago I planted arum italicum bulbs. They were planted correctly, but the leaves have remained very small no flowers or berries have been produced. The nursery where I bought the bulbs does not know what the problem might be and very kindly offered to replace them. In zone 8a could I plant new ones now?
What is wrong with those already in the ground? Thank you.

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