Quince fruit and its leaves have been used for years in the treatment of cough. They contain components that are effective in throat infections and have a soothing effect on the throat. You can brew the flowers and leafy parts of the plants and drink them. If you are drinking it for medicinal purposes, do not add sugar. You can brew dried quince leaves for 10-15 minutes and fresh quince leaves for 3-5 minutes and consume 2-3 cups per day.