Day lily, commonly known as "day lily" and scientific name day lily, belongs to Liliaceae and is the bud of a perennial herb. Day lily is delicious, tender and nutritious, such as pollen, sugar, protein, vitamin C, calcium, fat, carotene and amino acids. Its carotene content is even several times higher than that of tomatoes. Day lily is sweet and cool, and has the effects of stopping bleeding, diminishing inflammation, clearing away heat, promoting diuresis, promoting digestion, improving eyesight and calming the nerves. It has therapeutic effect on hematemesis, bloody stool, constipation, insomnia and galactorrhea, and can be used as a tonic after illness or postpartum. Soak in water before eating, and take off the stalks and wash them before cooking. Day lily is often cooked with vegetarian dishes such as black fungus, and can also be made into soup or fried with eggs, chicken and meat, which is rich in nutrition.

Characteristics of high-quality day lily: (1) Appearance: light yellow or golden yellow in color, fresh and tender without impurities, tight, long, even and thick. (2) Handfeel: grab a handful and knead it into a ball, which is soft and elastic. After each day lily is released, it can be stretched out quickly. (3) Taste: Daylily, commonly known as "Day Lily" and scientifically named Hemerocallis, belongs to Liliaceae and is the bud of a perennial herb. Day lily is delicious, tender and nutritious, such as pollen, sugar, protein, vitamin C, calcium, fat, carotene and amino acids. Its carotene content is even several times higher than that of tomatoes.

Characteristics of inferior day lily: (1) Appearance: dark yellow with reddish color, uneven length and thickness, mixed with impurities, uniform black color, mildew and deterioration. (2) Handfeel: hard and brittle, with poor elasticity and high water content; (3) Smell: smoky, sulfurous or musty.