Nothing is more fun for fruit lovers than to grow fruit trees from seeds, if they are able. Many people have tried this, or thought of trying it, at least once. The reason most people fail is that they take the seed straight from the fruit and put it into the ground. When this is done, most of the steps needed to properly grow a fruit tree are missed. Fruit trees take up to three months to get started from seed when grown properly; they won't bear fruit for three to ten years and until they're roughly four feet tall, depending on the fruit.
Pick the seeds from the fruit you want. Make sure the fruit is ripe, so the seeds are easier to pull out. If the seeds or pit cling to the fruit, it is not ripe enough. If your fruit has a pit for a seed, crack the outer shell with vice grips to expose the seed within to air and water.
Place the seeds or the cracked pit in a bowl of water overnight. Drain the water from the bowl using, a strainer to catch the seeds. Fill the clear jars with potting soil halfway. Poke a finger-sized ditch into the middle of the soil in each jar. Place one seed in each jar, and cover with the soil. Dampen the soil with water so that it is moist but not muddy.
Refrigerate the seeds for up to three months. Place the jars along the side of the refrigerator shelves but not in the back corners. Seeds need to be at 35 to 40°F to start the growth cycle; placing them in the back could cause them to freeze. Check the seeds every 30 days for signs of growth. This will be evident when tiny white roots are visible against the sides of the jar.
Keep the newly rooted tree in the jar. Move the jar to a window where it can absorb sunlight. The new seedling will need to be kept at about 70°F to sustain growth. Continue to water the plant to keep the soil damp. Note when the sprouts come out of the soil.
Take the milk carton and cut it in half with the knife. Fill the milk carton with potting soil. Dig a small hole in the soil. Scoop out the sprout from the jar and transplant it into the milk carton. Cover over the roots, and water lightly.
Let the tree grow to about three inches before moving it to permanent ground. If you start this project at the beginning of winter, the tree will be ready to plant by the last frost before spring. Keep the tree in the window until you are ready to plant it outside.