Starting fruit seeds is a misunderstood process with many of the important steps unknowingly ignored. To start fruit seeds, you need to allow a germination period of up to three months. The best time and place to start fruit seeds is in the early winter indoors; they will be ready to move to their permanent location when spring arrives.
Slice the fruit in half from top to bottom. Scoop out the seeds with the melon baller and put the contents in the small bowel. Make sure the fruit you choose is ripe so the seeds come out clean and don't cling to the fruit.
Fill the bowel halfway with warm water. Let the bowl sit overnight with the seeds in the water. This will loosen the pulp from the seeds, and keep the seeds from drying out or rotting.
Pour the contents of the bowel into the strainer. Thoroughly rinse the seeds so that the pulp is washed off. Use a strainer with small holes so the seeds don't get washed away with the pulp. Place the seeds on the paper towel. Fold the paper towel over the seeds once, and pat dry.
Line up the plastic cups. Fill each cup halfway with potting soil. Poke a finger in the center of the soil for each cup 1 inch deep; this is where the seed will go. Put one seed in each cup. Cover the seed with soil. Dampen the soil.
Put the cups in the refrigerator to the side of one shelf. Keep the cups away from the back wall, because the cold along that wall could freeze the seeds. Fruit seeds need an average of 35 to 40 degrees F to begin rooting.
Keep the cups in the refrigerator for up to three months. Check on them every 30 days, watering when you check to keep the soil damp. Tiny white roots will begin to show against the sides of the cups. This means the seeds have sprouted and are ready to move.
Move the cups to a windowsill where they can get sunlight. Use an east facing window, because the seeds will need a temperature range of 70 degrees to move to the next stage. Continue watering the soil to keep it damp, but not soaked; at this stage watering is done weekly.
Look for sprouts to shoot out from the soil around 14 days after moving the cups to the sunlight. Let the sprouts grow to 3 inches before moving them outdoors to their permanent location.