Cinnamon is available in either stick or powder form. While the sticks can be stored for longer, the ground powder has a stronger flavor. If possible, smell the cinnamon to make sure that it has a sweet smell, a characteristic reflecting that it is fresh. Cinnamon should be kept in a tightly sealed glass container in a cool, dark and dry place. Ground cinnamon will keep for about six months, while cinnamon sticks will stay fresh for about one year stored this way.