Some bulb suppliers sell bulbs that have already been given a chilling treatment. Space bulbs in bed according to size. Large bulbs should be 3 to 6 inches apart, small bulbs 1 to 2 inches. For best appearance, plant bulbs in masses. Cover the bed with 2 to 3 inches of mulch after planting.
Mulches insulate the soil, maintain even soil moisture and prevent mud from spattering the flowers.
Normal rainfall usually provides enough moisture for spring-flowering bulbs, but in a hot or dry spring, additional water will help to prolong blooming. Many bulbs normally send up leaves during late fall and winter. No special protection is necessary. In the spring, remove the flowers of tulips and daffodils after they fade to prevent seed formation. Leave the leaves on the plant for at least six weeks after bloom is finished or until they turn brown.