Documentation from the late 19th century shows between 65 and 140 distinct varieties of lettuce, depending on the amount of variation allowed between types – a distinct difference from the 1,100 named lettuce varieties on the market at the time. Although romaine lettuce is a heat resistant variety, lettuce, in general, are cold-weather plants and will not do well in hot weather. Lettuce is the only member of the genus Lactuca to be grown commercially. The problem with the popular iceberg (head) lettuce is that when the first head appears, the remainder is not far behind. Originally, the countries of North America and Western Europe ranked the highest in lettuce production in the world. Lettuce will also cross with Lactuca serriola (wild lettuce), with the resulting seeds often producing a plant with tough, bitter leaves. or on mountain tops, without getting eaten. Lettuce flowers more quickly in hot temperatures, while freezing temperatures cause slower growth and sometimes damage to outer leaves. It can be plagued by numerous nutrient deficiencies, as well as insect and mammal pests, and fungal and bacterial diseases. Lactuca sativa is a member of the Lactuca (lettuce) genus and the Asteraceae (sunflower or aster) family.  With the exception of the iceberg variety, lettuce is also a good source (10–19% DV) of folate and iron (table). Different locations tended to prefer different types of lettuce, with butterhead prevailing in northern Europe and Great Britain, romaine in the Mediterranean and stem lettuce in China and Egypt. By growing a few varieties you’ll have all the ingredients you need for a delicious, colourful salad. Lettuce growing systems Around the world, different styles of growing systems are used for greenhouse lettuce (Figure 1).  A 2007 study determined that the vacuum cooling method, especially prevalent in the California lettuce industry, increased the uptake and survival rates of E. coli O157:H7. In warm climates lettuce growing is usually restricted to the spring and fall, when temperatures are more moderate than in summer or winter.  Lettuce is closely related to several Lactuca species from southwest Asia; the closest relationship is to L. serriola, an aggressive weed common in temperate and subtropical zones in much of the world. These upright lettuces were developed by the Egyptians and passed to the Greeks, who in turn shared them with the Romans. This is done through the aid of modern technology, namely aeroponics and hydroponics. Lactuca virosa is biennial, similar to prickly lettuce Lactuca serriola but taller – it can grow to 200 cm (80 inches or almost 7 feet). 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.  Stem lettuce was first developed in China, and remains primarily cultivated in that country. LETTUCE has been successfully grown in space — bringing the colonisation of Mars a step closer say scientists. Optimum growth temperature for lettuce is 16 to 18 °C and the plant can tolerate temperatures as low as 7 °C. Weeds also act as homes for insects and disease and can make harvesting more difficult. In addition to its main use as a leafy green, it has also gathered religious and medicinal signific…  Plants in hot areas that are provided partial shade during the hottest part of the day will bolt more slowly. This lettuce is so local, they grow it right in the supermarket QFC supermarkets around Seattle now feature standing indoor farms that grow the produce in the store. Lettuce (Lactuca sativa) is an annual plant of the daisy family, Asteraceae. Growing lettuce in a clean room where there is very little dust and most germs have been eliminated means that lettuce is produced that can be eaten without washing. The lettuce is grown in styrofoam boards that float in a pool of nutrient solution.  The species was first described in 1753 by Carl Linnaeus in the second volume of his Species Plantarum. , Lettuce is very easy to grow, and as such has been a significant source of sales for many seed companies.  Lettuce was considered a sacred plant of the reproduction god Min, and it was carried during his festivals and placed near his images. Ancient Egyptians would relate lettuce to sexual prowess. The salad crops were free of disease and even more nutritious than ones grown on Earth. Cover with a very thin layer of compost or vermiculite. And lettuce is a great plant to start with if you want to ease into year-round growing. Trying to grow lettuce again this year and want to mimic where it grows best - and wild. Lettuce has been traced back to a native weed that was cultivated in Egypt for the oil gained from the seeds. There are several types or cultivars of lettuce. tatarica. , Due to its short lifespan after harvest, lettuce was originally sold relatively close to where it was grown. List Notes: Production is in metric tonnes for the year 2007.List also includes chicory. China alone produced about 13.5 million tons. 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. Ancient records note that lettuce was served at the royal table of Persian kings as early as 550 B.C.  Weeds can also be an issue, as cultivated lettuce is generally not competitive with them, especially when directly seeded into the ground. An explanation of the special requirements for container crops.Best growing conditions of lettuce.A step by step guide to growing lettuce in pots. But if you live in the area where it’s native, this is a fantastic native wild vegetable that you can easily grow on your wild homestead.. Your Fruits and Vegetables Come from: An Interactive Finder. The salad crops were free of disease and even more nutritious than ones grown on Earth. These include fused anthers that form a tube which surrounds a style and bipartite stigma.  Crowding lettuce tends to attract pests and diseases. Whilst lettuce is mostly used in salads it can also be used in soups, sandwiches and sandwich like meals. So, light but consistent watering is key. Most lettuce varieties are eaten fresh and are commonly served as the base of green salads.  Many insects are attracted to lettuce, including cutworms, which cut seedlings off at the soil line; wireworms and nematodes, which cause yellow, stunted plants; tarnished plant bugs and aphids, which cause yellow, distorted leaves; leafhoppers, which cause stunted growth and pale leaves; thrips, which turn leaves gray-green or silver; leafminers, which create tunnels within the leaves; flea beetles, which cut small holes in leaves and caterpillars, slugs and snails, which cut large holes in leaves. Longer taproots and more extensive secondary systems are found in varieties from Asia. -Kelly W. ANSWER: By planting a few seeds every two weeks or so, gardeners in many parts of the world can grow lettuce year round.Most varieties of salad greens really thrive in the cool and mild times of year, when temperatures are 60 degrees Fahrenheit or lower. Let’s have a look at how you can grow lettuce in a greenhouse! According to the study, published in … In 2011, lettuce was grown on 206,000 acres in California, which represented 73% of the total U.S. acreage . The harvested lettuce is best stored at 0 °C and a humidity of 96%. The red romaine was analyzed by NASA scientists Gioia Massa and Christina Khodadad who looked at three batches of lettuce grown on the space station between 2014 and 2016. California (71%) and Arizona (29%) account for the entire lettuce production in the US. As described around 50 AD, lettuce leaves were often cooked and served by the Romans with an oil-and-vinegar dressing; however, smaller leaves were sometimes eaten raw. , Lettuce also suffers from several viral diseases, including big vein, which causes yellow, distorted leaves, and mosaic virus, which is spread by aphids and causes stunted plant growth and deformed leaves. Lettuce spread to the Greeks and Romans; the latter gave it the name lactuca, from which the English lettuce is derived. 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