The lemon tree and lemon fruit provide an excellent example of the concept of dual purposes. This is the view that every entity in the universe exhibits dual purposes, simultaneously having both purposes for the whole and for the individual. The purpose for the whole means that by which the individual contributes to the preservation and development of the larger entity, and the individual purpose refers to the need to support an individual's own multiplication, development, self-preservation, and self-strengthening. These purposes for the individual and the whole are not independent but interdependent.
In the case of lemon, one purpose of the fruit is for reproduction of the plant, an individual purpose. But the fruit also provides value to humans in terms of various culinary purposes, including in drinks, garnishes for drinks, condiments, salad dressings, and squeezed over cooked meat or vegetables. In addition, there are various non-culinary purposes, such as the use of the oil in perfumes, cosmetics, and furniture polish and the tree for aesthetic purposes.
The lemon tree and fruit also shows human creativity in terms of the variety of culinary and non-culinary uses developed for the fruit, including in the well-known song lyrics: "Lemon tree very pretty, and the lemon flower is sweet, but the fruit of the poor lemon is impossible to eat."