The Meyer lemon, a citrus fruit native to China, is probably a cross between a lemon and a mandarin orange. Since it only grows 6 to 10 feet tall at maturity, the Chinese often grow it as a houseplant. The fruit of a Meyer lemon tree is round like a small orange, but yellow and tart. It is a delicious fruit, less tart than the regular lemon but more acid than an orange. You can collect the seeds and start your own tree, which could produce fruit in as little as 4 years.
Remove the seeds from the Meyer lemon. They tend to be seedy fruits, so you should have plenty of seeds to start with. Place the seeds in a paper towel to wipe them off, fold it a few times, and get it damp to keep the seeds moist while you prepare the pot for them.
Prepare a potting mixture of equal parts of sterile potting soil, dampened peat moss and perlite. Mix it well, and then fill a 6-inch plant pot within an inch of the top. Tamp the mix down a little with the palm of your hand to remove the larger air pockets.
Poke ½-inch holes into the surface of the potting soil and drop the Meyer lemon seeds into them. Firm the soil over the top of the seed and then water the pot until the water flows from the bottom of the pot.
Place the pot in a warm (65 to 70 degrees) spot where it can get full sunlight. This can be a sunny window or directly outside, depending on your present climate. The Meyer lemon is a tropical plant, even if it tends to be a little more cold hardy than the other lemons, so keep it in a warm environment.
Keep the soil moist by sprinkling it with a little water every day until you see a sprout appear. You can continue to water it daily, but make sure it never stands in the drainage water. As the plant gets larger, you can water it less.
Transplant your seedling when it is 2 or 3 inches high into a larger pot filled with equal parts of sand, peat moss and composted bark. Water it thoroughly once a week or when the top inch of the soil has dried out. Fertilize during the growing season with a liquid fertilizer formulated for acid-loving plants, but only at half strength.