Morning Glory is a long, flat leaf with slender, hollow stems. This leafy vegetable goes by many names such as Ong choy, kangkong (pronounced kancun), water spinach and Chinese spinach. It is a popular vegetable in Asian and Surinamese cuisine with a subtle and slightly sweet taste. Morning Glory varieties with large, deep green leaves are more flavorful than the smaller leaf varieties Morning Glory is a semi-water plant native to Southeast Asia. This fast-growing vegetable is grown primarily in wet, tropical climates. The mature plant produces white, trumpet-shaped flowers with a purple center, although the leaves are harvested before blooming for the best flavor.