A member of the geranium family, citronella carries the fragrance of citrus in its foliage. When leaves are crushed and the oil rubbed on the skin, it smells wonderful and may help naturally discourage mosquitoes. (The plant itself does not act as a deterrent to the pests.) Plants owe their medium green texture to the lacy leaves. Growing upright to 2 to 3 feet in height, they can be used as a summer border or one of several contrasting textures in a garden composition or a large mixed container.