Answer: Planting depth depends upon the size of the bulbs, so a general rule of thumb is to plant your bulbs 1 1/2 times the diameter of the bulb. For crocus, that equates to 2"-3" deep.
If you want a naturalized effect, scatter the bulbs by tossing them by the handful. Then plant each where it lands. For a massed effect, plant close together, but to allow space for the foliage, don't plant any closer than about 4".
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