What Plant Is Asparagus? A Detailed Explanation of Asparagus's Family, Genus, and Characteristics
Asparagus is the young shoot of Asparagus officinalis, a plant in the Liliaceae family and Asparagus genus, also known as di sun, nan di sun, lu sun, and so on. Its appearance resembles the young shoots of the grass-family plant reed, but it is completely different. A gift of nature that grows wild, it is rich in nutrients and has a unique flavor, combining the qualities of natural wild and green organic food. Its main producing areas include China, Peru, Germany, France, Spain, the United States, Japan, and others. At present, China is the largest producer of asparagus, far ahead of other countries.
Asparagus has a fibrous root system, composed of fleshy storage roots and fibrous absorbing roots. The fleshy storage roots arise from the underground rhizome nodes and are mostly distributed within the soil layer 30 cm below the surface. They are long-lived; as long as the growing point is not damaged, they can continuously extend forward every year, generally reaching about 2 m. They serve to anchor the plant and store assimilated nutrients from the stems and leaves. The fibrous absorbing roots are short-lived and will shrivel at any time under adverse conditions such as high temperature, drought, soil salinization, unsuitable pH, excessive moisture, or insufficient air.
The stem of asparagus is divided into three parts: the underground rhizome, the scale buds, and the aboveground stem. The underground rhizome is a shortened modified stem that mostly grows horizontally. When the branches become dense, new branches grow upward, causing the root crown to rise. The fleshy storage roots are borne on the rhizome. The rhizome has many nodes, and the buds on the nodes are covered by scales, hence they are called scale buds. The scale buds at the tip of the rhizome mostly cluster together, forming a scale bud cluster. The scale buds sprout to form the bulb product organ or the aboveground plant. The aboveground stem is a fleshy stem, and its young stem is the product.
The leaves of asparagus are divided into two types: true leaves and cladodes. The true leaf is a degenerated leaf blade, borne on the nodes of the aboveground stem, appearing as a triangular, membranous scale. The cladode is a modified branch, clustered and needle-like. The flowers are borne 1 to 4 per axil, greenish-yellow. The male flower has a perianth 5 to 6 mm long, with the filaments adnate to the perianth segments below the middle. The female flower is smaller, with a perianth about 3 mm long. The berry is 7 to 8 mm in diameter, red when ripe, with 2 to 3 seeds. The flowering period is May to June, and the fruiting period is September to October.
Asparagus is a dioecious plant, and male and female plants differ considerably in traits. In cultivation, male plants are mostly favored. Male plants are shorter, have more branches, flower earlier, and produce more stems; the individual weight of young stems is smaller, but the yield is high and the harvest period is longer. Female plants are taller, have sparse branches, flower later, and produce very few stems; the young stems are thicker, and the total yield is slightly lower.
Asparagus enjoys the reputation of "King of Vegetables" on the international market. It is rich in various amino acids, proteins, and vitamins, with contents higher than those of ordinary fruits and vegetables. In particular, the asparagine and trace elements such as selenium, molybdenum, chromium, and manganese in asparagus have the effect of regulating body metabolism and improving immunity. They have strong inhibitory effects and pharmacological effects in the prevention and treatment of high blood pressure, heart disease, leukemia, blood cancer, edema, cystitis, and others.