Cut open an overripe pomegranate using a kitchen knife and scoop out some of the juicy red blobs of fruit with a spoon. Each blob contains a pomegranate seed.
Rinse the seeds with warm water to wash away the fruit flesh.
Fold a few sheets of paper towel together and spread the seeds across the surface in a single layer.
Sprinkle a small amount of potting soil over the seeds.
Spray the seeds with water from a spray bottle until the paper toweling is saturated, but not dripping.
Slip the wet towel, layered with seeds and dirt, into the plastic bag. Do not seal the bag.
Place the bag in a warm place where it will not be disturbed.
Check the seeds daily; re-spray with water when the towel feels dry. The seeds should sprout in two to three weeks.
Remove the seeds from the plastic bag after they sprout, and place the paper towel in a sunny window. Keep the towel moist and wait until the seeds have small roots and a few leaves. They are then ready for planting.