How deep should I plant tulips?

FAQ
Question: 

How deep should I plant tulips?

Answer: 

Plant spring-flowering bulbs at a depth equal to 3 to 4 times their maximum bulb diameter.  Accordingly, tulips and daffodils should be planted 6 to 8 inches deep, crocuses and grape hyacinths 3 to 4 inches deep.  Large bulbs, such as tulips and daffodils, should be spaced 6 inches apart.  A three-inch-spacing is adequate for crocuses, grape hyacinths, and other small bulbs.  

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