Although many citrus trees grown from seed will not be true to the fruit from which they were taken, they will produce edible fruit. In some cases, the fruit produced by trees grown from seed may have more seeds than grafted varieties. However, seed-grown trees are a little more cold hardy, according to Texas A&M University. Some seedlings grown from seed may be thornier than grafted trees.
Spread potting soil at a depth less than 4 inches in glass or metal baking pans. You need to sterilize the soil. Sterilize enough to fill the pot in which you will start your citrus seeds.
Cover the pans with aluminum foil.
Place a meat thermometer in the soil and put the soil in a 180- to 200-degree oven. When the soil reaches 180 degrees, allow it to remain at that temperature for 30 minutes.
Remove the soil from the oven and let it cool before filling your pot.
Fill the pot where you will start your seeds.
Take a seed directly from a fruit. Citrus seeds do not germinate as well if you allow them to dry out.
Wash the seeds thoroughly to remove any sugars that may be sticking to them.
Plant the seeds 1/2-inch deep in the potting soil.
Moisten the soil. The soil needs to be moist for the seeds to germinate, but should not be wet.
Cover the pot with plastic wrap to reduce water evaporation from the soil.
Remove the plastic wrap and add water if the soil starts to look dry.
Keep the seeds in a warm location until they germinate.
Once you see two leaves, remove the plastic wrap and begin exposing the seedling to sunlight by placing it in sun one hour per day. Increase the time by an hour per day until your seedling can survive in full sun.