When you're stressed out, plants can be a great source of relief. Many people who are depressed find that plants are comforting. This is because they have an ability to calm us down and provide us with a sense of peace. It is said that a sense of well-being can be achieved by sitting in the presence of a plant. A study by the University of California, Los Angeles showed that people who were exposed to the smell of lavender were less anxious and more relaxed.