Fill a container with about 2 to 3 inches of high-quality potting soil with fertilizer already mixed in. Lightly tamp it with your fingers. Containers that are at least 5 inches deep work well for smaller daffodils and ones that are 6 inches deep work well for larger bulbs. No matter the container, it must have a drainage hole.
Arrange the bulbs on top of the soil with the tips facing up. Rotate and push the bulbs down a bit into the soil to secure them in place. Arrange daffodil bulbs close together with about 1/2 inch of space in between.
Fill the container with potting soil until just the tips of the bulbs are above the soil line. Tamp the soil lightly. In the end, the soil should stop about 1/2 to 1 inch below the container rim.
Water the daffodil bulbs well until you see water drip out the bottom drainage hole. Check the soil one or two times a week to ensure the soil remains slightly moist.