Mulching is the best method to protect your pomegranate trees from winter. They can survive that way in the prolonged cold, but it would be great if you used a frost blanket. Pomegranate trees should not be placed near heating vents whose hot, dry air will damage their leaves.
As with other plants in a dormant or semi-dormant state, water pomegranate trees sparingly during winter, the soil should only be moistened every week to ten days, down to an inch (2.5 cm).