In this lesson, teacher Dhirk Muscat discusses the importance of garden maintenance, especially in preparation for a hands-on gardening session. He emphasizes the necessity of using protective gear, such as gloves and sunglasses, while working outdoors, and highlights the significance of safety. The lesson includes identifying and caring for various plants, including the national tree of Malta, the Mastic tree, and the Rosemary plant. The students will engage in practical tasks like trimming and watering plants while learning about local flora and safety procedures in gardening.