Gardeners incorporate principles of feng shui to create harmonious outdoor spaces by carefully selecting and placing plants, flowers, and other elements in their garden to balance the flow of energy, or "chi." They may use principles such as the Bagua map to determine the best locations for different plants and decorations, as well as incorporating elements such as water features, rocks, and sculptures to enhance the overall balance and harmony of the space. By following these feng shui principles, gardeners aim to create a peaceful and relaxing environment that promotes positive energy and well-being.