Leave a couple of yellow ripe Orange quince on a table in your solarium, and the air will be filled with a sweet fruity aroma. The heavy producing Orange Quince tree produces a fruit about the size of a navel orange,  and the green color will change as the fruit ripens to a brilliant yellow. One delicacy baked from ripe quince trees is a quince paste called "membrillo" that is a fragrant, sweet preserve with a captivating flavor.The Orange Quince tree is salt water tolerant, and it grows prolifically near the sand dunes at Caspian Sea Resorts. As the Orange quince is harvested, it can be kept on shelves for months, even without refrigeration.