Oranges are a healthy fruit, containing loads of vitamin C and calcium, as well as other important nutrients. The next time you are enjoying an orange and you spit out the seeds, consider taking on a project that can be enjoyed by children and adults alike: Grow an orange tree from that seed. If you live in a warm climate, such as the Southern United States, you can grow orange trees outdoors. And if you live in a cooler climate, you can grow an orange tree in a warm, sunny room as a potted plant.
Wash your orange seeds as soon as soon as you remove them from an orange. To do this, place them in a strainer or colander and run them under lukewarm water for three minutes.
Fill a glass with water and place the cleaned seeds into the glass. Discard any that float to the top, as they are not usable seeds. Collect the seeds from the bottom of the glass and dry them off.
Wrap the seeds in a paper towel and place the towel in a sealed plastic bag. Store the bag in the vegetable compartment of the refrigerator for three weeks, as orange seeds need a period of cold-temperature dormancy in order to germinate.
Remove the seeds from the refrigerator and soak them in a lukewarm glass of water. In the meantime, prepare your pots with soil.
Fill the pots with seed-starter potting-soil mix, available at any home-and-garden center. The pots should be full, except for 1/2 an inch at the top.
Water the soil just enough to make it moist but not soggy.
Poke the orange seed 1/2 inch down into the soil and cover the seed with 1/2 inch of dirt.
Cover the tops of the individual containers with plastic wrap. Be careful to not cover any drainage holes with the plastic.
Place the pots in a sunny window where they are sure to get warmth. It can take between one and two months for the seeds to germinate. During this time, continue to check the moisture of the soil and water as necessary.
Remove the plastic covering when germination occurs. Continue to water the seeds, and when they are 5 to 6 inches tall, you can transplant them to a larger pot or place them outside during the day to harden off for a week before planting them in the ground.
Plant orange-tree seedlings in a warm location that receives full sun and has well-draining soil. If planting in a pot, keep in a warm, south-facing window and repot as the roots begin to fill the pot.