Being introduced to Dong Trieu 45 years ago, Na Dai is planted mostly in Communes of An Sinh, Viet Dan, Tan Viet of Dong Trieu Town. Dong Trieu Custard apple is big, thin peel, smooth, yellow when ripe, strong sweetness, with anoma and not grainy. Time of harvest usually takes place between June to August each year.
At harvest time, visitors can buy tough custard apple in Quang Ninh OCOP Centre, located in Vinh Hong area, Mao Khe Ward, Dong Trieu Town. Or more interesting, visitors can come to the custard apple gardens for a visit and select to buy the delicious fruits at gardens of households.