Before winter, prepare Plumeria for its dormant period by gradually reducing watering to allow the plant to enter dormancy naturally. Trim any excessive or weak growth and clean the plant by removing fallen leaves or debris. Check for pests or diseases and treat as needed. In colder climates, consider bringing potted Plumeria indoors or provide frost protection for in-ground plants. Store the plant in a cool, dry location during dormancy and refrain from fertilizing until spring. Proper preparation for winter will help your Plumeria withstand colder temperatures and prepare for new growth in the spring.