Growing an orange tree from a seed is a fun project for the whole family. Children especially enjoy watching a seed turn into a sprout and gradually grow into a tree. The bad news is that young orange trees do not bear fruit. In fact, it can take seven to 15 years before the tree produces. According to horticulturists with Texas A&M University, each orange seed may produce up to three seedlings. Two of them will be identical to the parent tree and one of them will be noticeably weaker, not genetically like the parent, and should be removed.
Fill the 4-inch planting pots with equal parts of potting soil and sand. Water the soil until water runs out of the drainage holes in the bottom of the pot, and then allow it to drain completely.
Remove the seeds from the orange and soak them in a bowl of room-temperature water for 24 hours.
Remove the seeds from the water and push them 1/2-inch deep into the soil in the planting pots. Plant one seed per pot. Cover the seeds with soil and place the pot in a warm area (at least 70 degrees F), but out of direct sun. Look for the seed to sprout within three to six weeks. Keep the soil moist during this time.
Place the seedlings in a sunny area and keep the soil moist, but not soggy.
Transplant the seedlings when they reach 5 inches in height. Fill the 6-inch planting pots with potting soil. Carefully remove the seedling from its current pot and replant it in the new pot at the same depth. Place it back in a sunny area and keep the soil moist. Transplant the orange tree seedling into the garden when it is 2 feet or more in height. This may take a year or longer.