Water the soil around daffodil blooms until it is moist but not soggy. Daffodil plants require a great deal of moisture after they bloom to keep their flowers lush and healthy. Stop watering the daffodil plants in summer, when they become dormant.
Sprinkle a small amount of low-nitrogen, high-potash fertilizer around the daffodil plants if their flowers are slow to appear.
Pinch off the flowers with your fingers when they start to fade. Deadheading the blooms in this fashion prevents the daffodil plants from putting more energy toward blooms that are dying.
Cut down a daffodil plant's leaves eight weeks after the plant's first bloom by snipping them off with clean garden shears or scissors.