If you live in an area that gets even the slightest bit of frost, the lime tree is not the plant for you. The most cold-intolerant of citrus trees, the lime tree will die if temperatures dip below 50 degrees F. For best results, plant seeds from Mexican or key limes and you will have limes within two or three years, according to horticulturists at the University of Florida.
Fill a planting pot with seed-starting mix, to within 14 inches of the pot's rim. Water the soil well and allow the water to drain from the bottom.
Plant the lime seed 1/4 inch into the soil.
Place the pot in a sunny, warm area. The temperature should remain at 75 degrees F or warmer. Make sure that the soil remains moist, but not soggy. Germination should occur within two weeks.
Repot your lime seedling into a 4-inch pot when it reaches 4 inches tall.