Sugars in plants are produced in the leaves. This happens through the process of photosynthesis, which takes place in chloroplasts within the leaf cells. The leaves are considered the main source where sugars like glucose and sucrose are generated using sunlight, water, and carbon dioxide. After production, these sugars are transported through the plant's phloem tissue to other parts such as roots, stems, flowers, fruits, or storage organs where they are used or stored.