Answer: The most important factors are sunshine, plenty of elbow room, adequate water, planting at the proper depth and leaving the foliage on the plants until it dies down naturally. The leaves manufacture and transport energy back into the bulbs for the following year's floral display. If you remove the foliage before it ripens the bulb will have only enough energy to send up new leaves, but no flowers. If the bulbs are planted too deeply they can run out of stored energy before they can develop flowers. If you planted yours only about 4" deep, that should be about right. I think they'll bloom for you next year - at least I hope so!
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