where is lettuce grown in the world
Thin seedlings out when they’re big enough to handle and keep the compost moist. Space lettuce grown on the International Space Station has been proven safe to consume, which could change the way astronauts eat during long-term spaceflight in the future. Aster yellows are a disease-causing bacteria carried by leafhoppers, which causes deformed leaves. Because lettuce is used in salads, we tend to eat more of it in summer. It is also stouter, the stem and leaves are more purple flushed, [disputed – discuss] the leaves are less divided, but more spreading. It is also stouter, the stem and leaves are more purple flushed, [disputed – discuss] the leaves are less divided, but more spreading. Let’s have a look at how you can grow lettuce in a greenhouse! The plant was first cultivated by ancient Egyptians from where it spread to Greece and Rome and was soon cultivated in most parts of Europe. There are several types or cultivars of lettuce. The problem with the popular iceberg (head) lettuce is that when the first head appears, the remainder is not far behind. By the end of the century, other types began to regain popularity and eventually made up over 30 percent of production. And today you rarely see a home garden without some kind of lettuce growing in it. Celtuce, a lettuce variety grown primarily in Asia for its stems, crosses easily with lettuces grown for their leaves. Lettuce is produce year round in the U.S. Celis regards the semi-closed greenhouse as the next step in the high-tech production of leafies. 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. The scenario changed since the late 1900’s when the crop began to be cultivated in large-scale in other parts of the world. The high water content of lettuce (94.9 percent) creates problems when attempting to preserve the plant – it cannot be successfully frozen, canned or dried and must be eaten fresh. All mine seem to be a slug magnet, so they must survive naturally somewhere in the world- like on desert islands surrounded by salt flats! This was done for several reasons, the most prominent being to boost sales by promoting a "new" variety or to prevent customers from knowing that the variety had been developed by a competing seed company. Lettuce quickly degrades when stored with fruit such as apples, pears and bananas that release the ripening agent ethylene gas. These lettuces tend to be larger, bolt-resistant and well-flavored. The International Space Station (ISS) has been experimenting with growing its own lettuce and good news for astronauts, a study found the space-grown variety to be just as nutritious as Earth-grown. In 1586, Joachim Camerarius provided descriptions of the three basic modern lettuces – head lettuce, loose-leaf lettuce, and romaine (or cos) lettuce. Lactuca virosa is biennial, similar to prickly lettuce Lactuca serriola but taller – it can grow to 200 cm (80 inches or almost 7 feet). In warm climates lettuce growing is usually restricted to the spring and fall, when temperatures are more moderate than in summer or winter. Ancient records note that lettuce was served at the royal table of Persian kings as early as 550 B.C. "Lettuce" is synonymous with "salad" for people all over the world.  The current word lettuce, originally from Middle English, came from the Old French letues or laitues, which derived from the Roman name. Lettuce varieties will cross with each other, making spacing of 1.5 to 6 m (60 to 240 in) between varieties necessary to prevent contamination when saving seeds. Post-Roman Europe continued the tradition of poaching lettuce, mainly with large romaine types, as well as the method of pouring a hot oil and vinegar mixture over the leaves. Similar to Mycelis muralis but showing more than 5 florets..  Lettuce is also used as a primary ingredient in the preparation of lettuce soup. Optimum growth temperature for lettuce is 16 to 18 °C and the plant can tolerate temperatures as low as 7 °C. Cover with a very thin layer of compost or vermiculite. The pappus remains at the top of each fruit as a dispersal structure. Outbreaks Associated with Fresh and Fresh-Cut Produce. It can be plagued by numerous nutrient deficiencies, as well as insect and mammal pests, and fungal and bacterial diseases. The advisory issued by the Ministry pertains to the crop grown in Salinas, California." However, when newly harvested lettuce seed is stored cryogenically, this life increases to a half-life of 500 years for vaporized nitrogen and 3,400 years for liquid nitrogen; this advantage is lost if seeds are not frozen promptly after harvesting.. Romaine is more popular in the Mediterranean countries. Countries worldwide are steadily supplying more and more produce to Americans eager to “eat fresh” year-round Large areas of lettuce are also grown in southeastern Australia, Japan, China, Israel, northern Mexico, Chile, Argentina, Brazil, and Peru. Lettuce is grown in home gardens worldwide. This photo was originally published in "This Tiny Country Feeds the World" in September 2017. The FDA and the Centers for Disease Control and Prevention on Tuesday said romaine lettuce grown in Florida is safe to eat. protect from slugs and snails. Space-Grown Lettuce Is Safe and Astronaut-Approved NASA’s vegetable production system, known as Veggie, may help pave the way for more sophisticated systems that could supplement astronauts’ diets during long trips to space. Heat generally prompts lettuce to bolt, with most varieties growing poorly above 24 °C (75 °F); cool temperatures prompt better performance, with 16 to 18 °C (61 to 64 °F) being preferred and as low as 7 °C (45 °F) being tolerated. By 50 AD, many types were described, and lettuce appeared often in medieval writings, including several herbals. The problem with the popular iceberg (head) lettuce is that when the first head appears, the remainder is not far behind. Conventionally grown lettuce, similarly packaged, is often sold below $4 per pound. By growing a few varieties you’ll have all the ingredients you need for a delicious, colourful salad.  Crowding lettuce tends to attract pests and diseases. The salad crops were free of disease and even more nutritious than ones grown on Earth.  Plants in hot areas that are provided partial shade during the hottest part of the day will bolt more slowly. Weeds also act as homes for insects and disease and can make harvesting more difficult.  Like other members of the tribe Cichorieae, lettuce inflorescences (also known as flower heads or capitula) are composed of multiple florets, each with a modified calyx called a pappus (which becomes the feathery "parachute" of the fruit), a corolla of five petals fused into a ligule or strap, and the reproductive parts. Although romaine lettuce is a heat resistant variety, lettuce, in general, are cold-weather plants and will not do well in hot weather. “Greenhouse manufacturers originally developed this type of greenhouse for fruit crops, but this approach is increasingly is being chosen for hydroponic production of lettuce too. 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