Spring bulbs may be planted through October. When purchasing bulbs, the bigger the bulb the more expense, but the greater the flower bloom size. Daffodil bulbs sometimes have two bulbs together. Double bulbs may be pulled apart before planting. Spring flowering bulbs generally need well drained soil, and do best under deciduous trees. They will be rather short-lived under evergreens. Large bulbs, such as tulips and daffodils, should be planted six to eight inches deep. Small bulbs are planted about four inches deep. The rule of thumb is to plant bulbs at a depth equal to two to three times the height of the bulb. Plant the bulb with the point up. It is a good idea to map the location, or place a colored golf tee above the bulb. Then mulch with three to four inches of mulch, and water thoroughly after planting.