There are more than 700 different species of eucalyptus. Some are small and shrubby, but some can grow to be 400 feet tall. Eucalyptus has a fresh and penetrating aroma familiar to most. The benefits of eucalyptus oil are broad and wide-ranging. It is very effective at relieving respiratory symptoms, it is cooling and refreshing in the summer, and warm and comforting in the winter. Insects are repelled by it, it stimulates memory, and helps to soothe wounds and heal acne.