Grand Nain Banana Tree also works well as a sound block to prevent the harsh noises of roads, as well as the noxious fumes, from reaching your house. The length of the Grand Nain banana fruit is about 12 inches long, if the weather conditions are right. The Grand Nain banana is a popular fruit to use by world class chefs for banana desserts and other banana creations. The Grand Nain Banana Tree fruits at 6 ft. in height. The Grand Nain banana plant works well in front of houses to provide seclusion and acts as a dense privacy barrier. The leaves of the Grand Nain banana plant can stretch outward to shade large areas. Commercially, the Grand Nain Banana tree is the highest yielding of all others. Sometimes two full stalks of bananas grow on a single plant.