Growing an orange tree from a seed probably sounds like a pretty simple proposition. In many ways, it is. However, don't overlook a few critical steps if you want your orange tree to flourish rather than remain locked up inside the seed. With a little patience and care, you can grow fruiting, beautiful orange trees from a seed.
Remove the seeds from the orange. The seeds must be rinsed thoroughly, using cool or room-temperature water to remove all the fruiting body. Orange fruit actually prevents the seed from germinating so that the plant does not grow out of the fruit carrying it.
Refrigerate the seeds for three weeks. Wrap them in a paper towel and place them in the vegetable drawer in your refrigerator.
Soak the seeds in room-temperature water. Let them soak for two to three hours before planting.
Plant the seed in the small pot. The pot should be filled nearly full with potting compost. Push the seed into the soil with a finger, then cover it up and place the pot in a warm, sunny window sill.
Water your seed only when the soil starts to dry out. You want the soil to be moist, but at no time should it be muddy or sticky. Continue patiently watering your potted seed for several months before the plant appears. Once it does, start "feeding" the plant water-soluble fertilizer once a week.
Re-pot the plants. Once your orange tree reaches a height of about 6 inches, move it to a larger pot. Do not immediately transplant the plant outdoors, but move the pot outdoors; when it outgrows the larger pot, plant it in the ground. If you live in an area where the weather gets below freezing, leave the tree planted in a portable pot so that it can be moved inside during cold months.