Daffodils (Narcissus spp.) are spring bulb flowers that are normally grown in the ground outdoors because the bulbs are so cold-hardy. Daffodils can be grown easily in containers, however, and kept as houseplants. Daffodil bulbs are often forced into blooming when they're grown indoors, but they don't have to be. Although planting the bulbs takes some careful attention, growing the daffodils and maintaining them isn't difficult.
Pot your indoor daffodils in 1- to 2-gallon planter pots with drainage holes in the bottom. Plant the daffodil bulbs in a mixture of three parts sterilized soil and one part perlite, planting the bulbs about one-third of the way from the top of the pot. Add a pinch of 0-10-10 NPK formula fertilizer to the bottom layer of potting soil, keeping it from touching the bulb.
Water daffodil bulbs thoroughly to saturate the potting soil once each day for the first week after planting them. After the first week, water the daffodils deeply and thoroughly whenever the top layer of soil begins to dry out.
Apply a 5-10-10 NPK formula fertilizer to the daffodils after they finish blooming. Follow the dosage instructions on the label.
Keep the daffodils in a warm, sunny location. Place the daffodils beside a bright, south-facing window and set them outdoors in a sunny spot during summer. Maintain normal to warm indoor air temperatures around your daffodils, keeping them away from heating and air conditioning vents.
Turn the planter pot onto its side about six weeks after the daffodils stop blooming and store it in a dry location. In fall, turn the pot right side up again and water the soil thoroughly. Set the pot outside in a sunny spot when temperatures aren't below freezing.