No matter what kind of bulbs you are planting, a good general rule for ensuring a beautiful display is to set them at a depth equal to three times their diameter. Place them in their planting holes pointy side up, and backfill holes with soil, firming it to eliminate air pockets and to secure bulbs in place.
Before digging, Martha always works out a planting scheme by laying bulbs on top of the ground where they will grow. Irregular patterns tend to create the most natural-looking drifts of flowers. She likes to plant bulbs like tulips and daffodils in drifts of 15 or more.