Considered the strongest lemon-scented herb, Lemon Verbena is a must have in your culinary herb garden. Its scent and essential oil properties are almost intoxicating. It smells so fresh and is delightful used in tea and summer drinks or served with fish or chicken. A little more temperamental than some herbs, lemon verbena needs more care but overall is an easy plant to grow. It can be grown outside but prefers warmth and is an easy plant to grow inside as well.