Yes, but you need to process it a bit first. After you clean the leaves, chop them finely, and mix with olive oil to make a thick paste. Then for ease of use later, freeze it in small quantities – an ice-cube tray is ideal.
Once the cubes are frozen, transfer them to a heavy plastic freezer bag, and take them out one by one as you need them. They will be great for flavoring soups, sauces, salad dressings, etc.