Day lily, also known as day lily, tranquilizing vegetables, etc. , widely distributed, nutritious, rich in protein, fat, calcium, phosphorus, iron and various micronutrients. The picking of daylily is seasonal, and the quality is the best when the buds are full and not flowering. If the buds are open and bare, the nutrients will be lost and the quality will be poor. Dried day lily is a kind of fresh, tender, fragrant and unopened day lily bud, which is made by drying, selecting and packaging, with unique flavor and refreshing fragrance. When purchasing, the normal day lily is golden yellow or brownish yellow, while the sulfur-smoked day lily is tender yellow, which is lighter than the normal day lily. The color of normal day lily is uniform, but the color of smoked day lily is uneven; Second, smell with the nose, normal day lily should have its own fragrance, and there is no other smell, while smoked day lily has a pungent smell; Hold the day lily tightly with your hands, and once you let go, the vegetables will automatically spread out and return to their original state, indicating that the dried vegetables are of good quality. If you rub it with your hands, it will still form a ball after you let go, and it will not be restored to its original state, indicating that vegetables are wet, high in moisture and easy to mold. At present, the industrialized processing of day lily mostly stays in dried flowers and dried vegetables for people to eat directly. Drying methods include: steaming soil or film wrapping. However, due to weather changes, this method will decompose sugar into furaldehyde, which will react with nitrogen-containing substances to produce black protein, which will change the yellow color of day lily into brown or even dark brown, and the flavor will change from sweet to bitter. Normal dry daylily without medication is brown!