By the late 1900s, Asia, South America, Australia and Africa became more substantial markets. The stem passes directly through the round leaf and this makes identification easy. Water lettuce does bear flowers, but they are usually hidden down deep under the leaves. Water lettuce grows best if it is not constantly being moved around. Crisphead lettuces may need encouragement to send up the seed stalk, which you can provide by cutting them open on top. Oilseed – This type is grown for its seeds, which are pressed to extract an oil mainly used for cooking. This seed stalk (which has leaves along its stem) will form flowers toward the top and eventually seeds. It has less nutrients than other varieties, a high water content, and a pretty flat taste. Lettuce and other greens are cool weather crops. Lettuce (Lactuca sativa) is an annual plant of the daisy family, Asteraceae. Lettuces are so pretty!  L. sativa also has many identified taxonomic groups, subspecies and varieties, which delineate the various cultivar groups of domesticated lettuce. What Is Lettuce? ‘Four Seasons’ (‘Merveille Des Quatres Saisons’) has red outer leaves and inner leaves with a pink and cream … Lactuca sativa is a member of the Lactuca (lettuce) genus and the Asteraceae (sunflower or aster) family. 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.. Most gardeners rip … Lettuce is a shallow-rooted plant. You can do this with each head of lettuce this plant produces. When the weather consistently reaches 75°F/23°C many lettuce … , Other bacteria found on lettuce include Aeromonas species, which have not been linked to any outbreaks; Campylobacter species, which cause campylobacteriosis; and Yersinia intermedia and Yersinia kristensenii (species of Yersinia), which have been found mainly in lettuce. You don’t need to pick the whole lettuce. These are regarded as …  The consumption of lettuce in China developed differently from in Western countries, due to health risks and cultural aversion to eating raw leaves. The quicker lettuce grows, the more tender and sweet it is!  The name romaine came from that type's use in the Roman papal gardens, while cos, another term for romaine lettuce, came from the earliest European seeds of the type from the Greek island of Cos, a center of lettuce farming in the Byzantine period. Click here to learn more about growing lettuce companion plants. In the bolting stage, a plant stops focusing so much on producing foliage and starts to turn its attention toward reproduction, sending out a … Slobolt, for example, can be grown in warmer temperatures. It happens due to stress factors … Sometimes, lettuce will rapidly flower before it has produced its full potential of edible leaves. , Western Europe and North America were the original major markets for large-scale lettuce production. Lettuce plants don’t need to be pruned in the sense that some other plants do, where a plant is trimmed back early in the season so it will grow bushier and more compact. Plants that have produced a plump head or substantial greens throughout the season are likely flowering naturally and should be left to go to seed. By the same token, it is a good neighbor itself to some plants more than others. Aster yellows are a disease-causing bacteria carried by leafhoppers, which causes deformed leaves. By the time … Pale to white lettuce, such as the centers in some iceberg lettuce, contain few nutrients.. How to Grow Lettuce. Typically lettuce will flower when the temperature warms in late spring or early summer. capitata) straight from the garden. Lettuce's native range spreads from the Mediterranean to Siberia, although it has been transported to almost all areas of the world. A Garbage Bag is for More Than Trash. tatarica. 1. Yes, Lettuce is a flowering plant. If you keep all plants there is a chance that they will not grow as full as just one lettuce. Lettuce, like a lot of plants, has some plants that it likes having as neighbors, and some that it doesn't.  There are seven main cultivar groups of lettuce, each including many varieties: The butterhead and crisphead types are sometimes known together as "cabbage" lettuce, because their heads are shorter, flatter, and more cabbage-like than romaine lettuces. Number of Flowers: Dandelions have just one flower. Heading varieties of lettuces are commonly started in flats, then transplanted to individual spots, usually 20 to 36 cm (7.9 to 14.2 in) apart, in the garden after developing several leaves. Lettuce is an annual plant belonging to the daisy family. Lettuce will also cross with Lactuca serriola (wild lettuce), with the resulting seeds often producing a plant with tough, bitter leaves.  Most lettuce is used in salads, either alone or with other greens, vegetables, meats and cheeses. Butterhead – Also known as Boston or Bibb lettuce. It is very similar in look and medicinal effects to Wild Lettuce, Lactuca virosa. It is in the sunflower family ( Asteraceae or Compositae – also known as the aster family, daisy family, or the composite family). so don't disturb the roots when hoeing. Though lettuce looks like cabbage, one difference between the two is the water content. Cabbage has less water and is also tougher than lettuce. However, genetically modified lettuce is not currently used in commercial agriculture. , Lettuce is very easy to grow, and as such has been a significant source of sales for many seed companies. To plant, water lettuce can be simply spread across the surface of your pond during late April after the last frost of the season.  Lettuce is also used as a primary ingredient in the preparation of lettuce soup. When lettuce bolts and runs to seed long before the plants mature it’s usually a sign that the plants were stressed in some manner. Because of this, the challenge with lettuce is to prevent its biological clock from deciding to flower for as long as possible. Head lettuce is usually started indoors or in a cold frame and transplanted in the spring after the last frost date. Water until the soil is moist 6 inches below the surface. Far from the shrink-wrapped iceberg lettuce we all know so wellperfectly round and crunchy, almost all water, and able to last a long time after harvestthe multitude of lettuce varieties available at the grocery store and farmers markets offer a wide range of textures, colors, and flavors. Lettuce belongs to the daisy family (Compositae). Certain varieties contain more than others, and some selective breeding and genetic modification studies have focused on using this trait to identify and produce commercial varieties with increased pest resistance. Lettuce is only one of many vegetables that humans find most tasty before flower production begins. Lettuce is also eaten as part of the Jewish Passover Seder, where it is considered the optimal choice for use as the bitter herb, which is eaten together with the matzah. It is so awesome to pick a. 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