Do you mean orange leaves from a tree that grows the fruit, oranges? We're in the US & I want to be sure we're talking about the same thing. Excellent tip, wish I lived near an orange grove! Be cautious of using leaves that have been treated w/ pesticides. At our house we drink hot water to which we add a tablespoon or two (whatever you can handle) of bottled concentrated lemon juice. Tastes good when you have a cold, soothing. If you don't want just the lemon juice, make hot tea & add it to the tea. You can also use the juice of a fresh lemon. Clears the head, sinus, chest very well also. We drink 2-3 cups per day when we have congestion.