[54] Viruses, including hepatitis A, calicivirus and a Norwalk-like strain, have been found in lettuce. In the bolting stage, a plant stops focusing so much on producing foliage and starts to turn its attention toward reproduction, sending out a … There are also a few varieties with yellow, gold or blue-teal leaves. Lettuce is a cool season crop and growing lettuce in pots is possible from spring to fall in most of the regions. The factors listed above cause bolt when the plant gets too much of them. [52] 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. 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. Great article...I have lettuce on my mind. Learn all you need to know about growing lettuce, ... in window boxes, or even flower baskets. Lighting: Dwarf Water Lettuce needs medium light. 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. It’s easy to simple rub the pappus between your fingers and allow the tiny surfboard shaped seeds to fall into your hand. 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. For example, ancient Egyptians thought lettuce to be a symbol of sexual prowess[45] and a promoter of love and childbearing in women. Great article...I have. [46] Lettuce is also used as a primary ingredient in the preparation of lettuce soup. I was widely put to use throughout the Civil … You’ll need to snip the corners off of it so that it can have a mostly rounded top. It is a cool-season vegetable and prefers the cooler seasons of spring and autumn for leaf production. Click here to learn more about growing lettuce companion plants. It takes a little longer to grow — about 80 to 95 days, and generally needs more space to mature into large heads. [31] 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. [33] Hydroponic growing methods can reduce this water consumption by nearly two orders of magnitude. [45] Stem lettuce was first developed in China, and remains primarily cultivated in that country. Continue cutting plants as needed, clearing a swath from one side of the bed to the other. Method 2 of 2: Growing Loose-Leaf Lettuce. Submitted by Carolyn Chewning on March 30, 2013 - 8:40am. During the 81–96 AD reign of Domitian, the tradition of serving a lettuce salad before a meal began. How to Grow and Save Lettuce Seed It is very hard not to grow lettuce seed. [31] Plants in hot areas that are provided partial shade during the hottest part of the day will bolt more slowly. Lettuces are so pretty! Because lettuce does not grow well in the heat, it can be difficult to continue to have lettuce or salad all summer long. Lettuce and other greens are cool weather crops. Stalk: Dandelion will not grow a thick stalk as it grows older. Usually, when the weather heats up consistently for the summer, lettuce all bolts and you will have to wait until the weather starts to cool off to resow for a fall crop. The blooms resemble small dandelions and the plant gets quite tall as if it's reaching for the sun. Lettuce, like a lot of plants, has some plants that it likes having as neighbors, and some that it doesn't. Simply trim off any leaves you wish to use while the plant is growing, about an inch above the crown where all the leaves meet, so the plant can continue to grow. It is so awesome to pick a 'fresh … Store them in a dark and dry location, and mark each container with the variety and date harvested. [55] This narcotic effect is a property of two sesquiterpene lactones which are found in the white liquid (latex) in the stems of lettuce,[30] called lactucarium or "lettuce opium". These include fused anthers that form a tube which surrounds a style and bipartite stigma. Lettuce flowers more quickly in hot temperatures, while freezing temperatures cause slower growth and sometimes damage to outer leaves. 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. Spain is the world's largest exporter of lettuce, with the US ranking second. [16] Lettuces have a wide range of shapes and textures, from the dense heads of the iceberg type to the notched, scalloped, frilly or ruffly leaves of leaf varieties. Plus, the plant will keep producing. Water lettuce does bear flowers, but they are usually hidden down deep under the leaves. Lettuce turns bitter once the flower stalk begins to form, so harvest before a central stem starts to form. This process, known as bolting, produces bitter lettuce. When lettuce begins to flower, this is known as "bolting". Once your lettuce grows for about 3-4 weeks you can either begin to thin it to allow only one plant to grow or keep all plants in the pots. This page was last edited on 31 December 2020, at 11:28. This shoot will grow taller than the rest of the plant and then produce clusters of flower heads. To do this, plant new seeds every two weeks throughout the year. Cause lettuce to your garden specifically look for bolt-resistant lettuce cultivars for spring and fall in... Will eventually mature and sprout flowers and then seed pods flower when the plant flowers, it produces aged! Generally planted straight into the garden in thick does lettuce flower 18 ] and.. 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