China is the world leader in lettuce production, producing half of the world's lettuce. Stem lettuce is grown in the country and the stems are prepared as a cooked vegetable. According to estimates given by the Food and Agriculture Organization (FAO) in 2006, China produced around 11,005,000 metric tonnes of lettuce on 500,250 hectares of land. In 2010, the FAO reported that some 12,574,500 tonnes (12,375,900 long tons; 13,861,000 short tons) of lettuce were produced during that year. [1] Taiwan is also a producer of good quality head lettuce, which is an export commodity. [2]
China first started growing lettuce (Lactuta sativa L.) in the seventh century, according to one source, [3] although another source writes that lettuce was introduced earlier, in the fifth century. [4] [lower-alpha 1] It is not quite clear as to how lettuce got to China. [6] The country has long been the leading lettuce producer in the world, [7] with roughly 8,000,000 metric tons (7,900,000 long tons; 8,800,000 short tons) of lettuce produced in 2005, [8] and 11,005,000 metric tons (10,831,000 long tons; 12,131,000 short tons) on 500,250 hectares (1,236,100 acres) in 2006. [9] China accounts for around half of the world's total lettuce production. [lower-alpha 2]
As per FAO's Preliminary Statistics for 2011 for China, the area under lettuce and chicory was 570,302 hectares (1,409,250 acres) with a total production of 13.431 million tonnes. [12] Most of the lettuce produced in China is purchased and consumed within the country. [13]
The common types of lettuce grown are the Butterhead (Lactuca sativa var. capitata), the Crisphead (Lactuca sativa var. capitata), the Looseleaf (Lactuca sativa var. crispa), the Romaine (Lactuca sativa var. longifolia), and the Celtuce. [14] Celtuce is grown widely in the country and its stems are prepared as a cooked vegetable. [15] Celtuce (Lactuca sativa var. angustana), an endemic plant of China, is also called stem lettuce. The name is derived from two words “celery” and “lettuce.” It is succulent, has thick stem and tender leaves. The plant grows to a height of 10 to 12 inches and has leaves at the end, similar to that of lettuce. Its skin tastes bitter, and hence is removed by paring it and leaving only the green core of it which is soft and translucent. [14]
Prickly lettuce or China lettuce (Lactuca serriola) is also a variety grown in waste lands along roadsides, yards and gardens. It is an irrigated crop that is suited to grow on light or dry soils. [16]
In Taiwan, head lettuce is an export crop (40–50% of produce exported) grown in the sub-tropical mountainous area, which is suitable (due to its cool climate) for its cultivation. This crop is a good source of vitamin A and folic acid. It is green in colour and has crisp leaves and is of the compact variety. [2] Though low in calories it is a vitamin and mineral supplement. Stem lettuce provides vitamin C and also calcium. [17]
In China, lettuce is not eaten in a raw form of salad. The preferred common usage is in plain form as stir-fried (cooked for a short time) and occasionally mixed with mushroom and other vegetables, and well spiced with garnishing. It is also steamed individually. It is also used in combination with meat dishes such as “Sliced Pork Stir Fried with Lettuce.” Lettuce soups are also common, along with fish or minced chicken. For this preparation, fresh and crisp lettuce is chosen and the soup is consumed hot and not allowed to go tasteless. Other varieties of dishes are “Lettuce and fermented Bean Cake” and “Clear Simmered Bean Card with Lettuce and Cellophane Noodles.” [17] Stem lettuce, which originated in China, is cooked and used as a food item. [7]
It is common belief in China that lettuce is a symbol for wealth [18] and good luck. It is a festive food during birthdays, New Year's Day and several other festive occasions. [19] Celtuce is pickled and used as a side dish during meals. [14]
Lettuce is an annual plant of the family Asteraceae. It is most often grown as a leaf vegetable, but sometimes for its stem and seeds. Lettuce is most often used for salads, although it is also seen in other kinds of food, such as soups, sandwiches and wraps; it can also be grilled. One variety, celtuce, is grown for its stems, which are eaten either raw or cooked. In addition to its main use as a leafy green, it has also gathered religious and medicinal significance over centuries of human consumption. Europe and North America originally dominated the market for lettuce, but by the late 20th century the consumption of lettuce had spread throughout the world. As of 2021, world production of lettuce and chicory was 27 million tonnes, 53 percent of which came from China.
Palm oil is an edible vegetable oil derived from the mesocarp of the fruit of oil palms. The oil is used in food manufacturing, in beauty products, and as biofuel. Palm oil accounted for about 36% of global oils produced from oil crops in 2014. Palm oils are easier to stabilize and maintain quality of flavor and consistency in ultra-processed foods, so they are frequently favored by food manufacturers. Globally, humans consumed an average of 7.7 kg (17 lb) of palm oil per person in 2015. Demand has also increased for other uses, such as cosmetics and biofuels, encouraging the growth of palm oil plantations in tropical countries.
Broccoli is an edible green plant in the cabbage family whose large flowering head, stalk and small associated leaves are eaten as a vegetable. Broccoli is classified in the Italica cultivar group of the species Brassica oleracea. Broccoli has large flower heads, or florets, usually dark green, arranged in a tree-like structure branching out from a thick stalk, which is usually light green. The mass of flower heads is surrounded by leaves. Broccoli resembles cauliflower, which is a different but closely related cultivar group of the same Brassica species.
Spinach is a leafy green flowering plant native to central and Western Asia. It is of the order Caryophyllales, family Amaranthaceae, subfamily Chenopodioideae. Its leaves are a common edible vegetable consumed either fresh, or after storage using preservation techniques by canning, freezing, or dehydration. It may be eaten cooked or raw, and the taste differs considerably; the high oxalate content may be reduced by steaming.
The parsnip is a root vegetable closely related to carrot and parsley, all belonging to the flowering plant family Apiaceae. It is a biennial plant usually grown as an annual. Its long taproot has cream-colored skin and flesh, and, left in the ground to mature, becomes sweeter in flavor after winter frosts. In its first growing season, the plant has a rosette of pinnate, mid-green leaves. If unharvested, it produces a flowering stem topped by an umbel of small yellow flowers in its second growing season, later producing pale brown, flat, winged seeds. By this time, the stem has become woody, and the tap root inedible. Precautions should be taken when handling the stems and foliage, as parsnip sap can cause a skin rash or even blindness if exposed to sunlight after handling.
The Brussels sprout is a member of the Gemmifera cultivar group of cabbages, grown for its edible buds.
Lactucarium is the milky fluid secreted by several species of lettuce, especially Lactuca virosa, usually from the base of the stems. It is known as lettuce opium because of its sedative and analgesic properties. It has also been reported to promote a mild sensation of euphoria. Because it is a latex, lactucarium physically resembles opium, in that it is excreted as a white fluid and can be reduced to a thick smokable solid.
Northern root-knot nematode is a species of vegetable pathogens which produces tiny galls on around 550 crop and weed species. They invade root tissue after birth. Females are able to lay up to 1,000 eggs at a time in a large egg mass. By surviving harsh winters, they can survive in cold climates.
Leaf vegetables, also called leafy greens, pot herbs, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Leaf vegetables eaten raw in a salad can be called salad greens.
Celtuce, also called stem lettuce, celery lettuce, asparagus lettuce, or Chinese lettuce, is a cultivar of lettuce grown primarily for its thick stem or its leaves. It is used as a vegetable. In China, the family is informally called woju, which is also the name of a cultivar. It is especially popular in both China and Taiwan, where the stem is interchangeably called wosun or qingsun(青筍; 青笋; qīngsǔn).
Lactuca virosa is a plant in the Lactuca (lettuce) genus, often ingested for its mild analgesic and sedative effects. It is related to common lettuce, and is often called wild lettuce, bitter lettuce, laitue vireuse, opium lettuce, poisonous lettuce, tall lettuce, great lettuce or rakutu-karyumu-so.
Lactuca serriola, also called prickly lettuce, milk thistle, compass plant, and scarole, is an annual or biennial plant in the tribe Cichorieae within the family Asteraceae. It has a slightly fetid odor and is commonly considered a weed of orchards, roadsides and field crops. It is the closest wild relative of cultivated lettuce.
Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, leaves, roots, and seeds. An alternative definition of the term is applied somewhat arbitrarily, often by culinary and cultural tradition. It may exclude foods derived from some plants that are fruits, flowers, nuts, and cereal grains, but include savoury fruits such as tomatoes and courgettes, flowers such as broccoli, and seeds such as pulses.
A crop is a plant that can be grown and harvested extensively for profit or subsistence. In other words, a crop is a plant or plant product that is grown for a specific purpose such as food, fibre, or fuel.
Lactuca canadensis is a species of wild lettuce known by the common names Canada lettuce, Canada wild lettuce, and tall lettuce. Its true native range is not clear, but it is considered to be a native of the eastern and central parts of North America. It naturalized in the western part of the continent as well as in Eurasia.
Agriculture in Kenya dominates Kenya's economy. 15–17 percent of Kenya's total land area has sufficient fertility and rainfall to be farmed, and 7–8 percent can be classified as first-class land. In 2006, almost 75 percent of working Kenyans made their living by farming, compared with 80 percent in 1980. About one-half of Kenya's total agricultural output is non-marketed subsistence production.
A crop wild relative (CWR) is a wild plant closely related to a domesticated plant. It may be a wild ancestor of the domesticated (cultivated) plant or another closely related taxon.
Garlic production in China is significant to the worldwide garlic industry, as China provides 80% of the total world production and is the leading exporter. Following China, other significant garlic producers include India and Bangladesh (1%). As of 2019, China produced 23 million tonnes annually.
Lactuca quercina is a species of wild lettuce native to Europe and Asia. It is an annual or biennial herb in the tribe Cichorieae within the family Asteraceae growing from a taproot to maximum heights of 50–200 cm (19.5–78.5 in) or more.
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