Grow an apple tree from seed by allowing the seeds to dry out completely before sowing them in well-draining soil and watering them regularly. If you live in a northern climate with temperatures consistently below 35 degrees Fahrenheit in the winter, use Honeycrisp, McIntosh or Paula Red apple seeds. For minimum temperatures above 35 degrees Fahrenheit, opt for Fuji, Granny Smith or Gala apple seeds.
For both cold- and warm-climate apple seeds, remove the seeds from the apple, and allow them to dry out completely at room temperature. Avoid placing them in a sunny or overly warm location, such as a windowsill. For cold climate apples, sow the dry seeds directly outside during the winter in shallow holes at least 12 inches apart.
Cover the seeds with a thin layer of soil and 2 inches of sand. Water the seeds once they sprout only if the soil isn't moist. Once the seedlings grow to 8 inches, feed each one 1 tablespoon of dry urea. Avoid placing the urea directly on the plant.
For warm-climate apples, chill the dried out seeds in a jar in the refrigerator for at least two months before adding moist peat moss to the jar and chilling them for another few months. After the last frost of the season, sow the seeds outside.