Daffodils will return year after year if you allow the green leaves to mature and yellow after the flowers fade. The bulbs must be allowed to go dormant to fuel the flower growth the following year.
If you are like me and left your fall-bought-bulbs on the front porch since October, you should be OK, but if you are buying now and are looking at tulips or daffodils which need 12-15 weeks of ...