The most popular method of introducing key lime trees into the home landscape is by planting seedlings. These 2-year-old trees are readily available at nurseries, easy to transplant and they produce fruit in just a few years. However, it is also possible to propagate key lime trees from seed. If planted indoors and well cared for, key lime seeds will soon germinate and grow healthily until you are ready to plant them out of doors, or transfer them to a larger container for indoor growth.
Fill your pot to within 1/2 inch of its lip with quality, well-drained seed-starting potting soil. Pat the soil down with your hands once you're done to remove any air pockets from the soil.
Plant the key lime seed 1/4 to 1/2 inch deep.
Water the soil with a watering can until water drips out of the drainage hole(s) in the bottom of the pot. Continue to keep the soil moist (not soaking) at all times. Test the soil's moisture level frequently and water when necessary.
Place the pot in a warm spot where it will receive indirect sunlight. The key lime seed should germinate with in two weeks.