Lemon trees are small trees that can be grown as large container plants to make them easy to bring indoors when freezing weather threatens, or as outdoor trees in mild climates. Outdoors, they can grow to 20 feet tall, but they are usually pruned to shorter heights.
When starting lemons from seed, you may not get a tree that produces lemons exactly like the parent. The type of lemon depends on the type of tree that fertilized the flower. Regardless of the type of tree, you should get edible fruit within 15 years.
Fill a flower pot to within an inch or two of the top with sterile potting soil from a unopened bag.
Cut a lemon in half with a knife and remove a plump, mature seed.
Rinse the seed in water to remove the sugar from the seed coat. Sugar encourages fungi that can kill young plants.
Plant the seed about 1/2 inch deep in the center of the pot. Plant the seed promptly. Lemon seeds don't tolerate drying, and leaving it out in the open lessens the chance of germination.
Moisten the soil with water. Keep the soil moist but not soggy at all times.
Cover the pot with plastic wrap. Place it in a warm location such as the top of the refrigerator until the seed germinates.
Move the pot to a location with bright light once it germinates and remove the plastic wrap.