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Flax ( Linum usitatissimum), also known as common flax or linseed, is a member of the genus in the family . It is a food and fiber crop cultivated in cooler regions of the world. Textiles made from flax are known in Western countries as , and are traditionally used for bed sheets, underclothes, and table linen. Its oil is known as . In addition to referring to the plant itself, the word "flax" may refer to the unspun fibers of the flax plant. The plant species is known only as a cultivated plant, and appears to have been domesticated just once from the wild species , called pale flax. The plants called "flax" in New Zealand are, by contrast, members of the genus .


Description
Several other species in the genus Linum are similar in appearance to L. usitatissimum, cultivated flax, including some that have similar blue flowers, and others with white, yellow, or red flowers. Some of these are plants, unlike L. usitatissimum, which is an .

Cultivated flax plants grow to tall, with slender stems. The are green, slender , 20–40 mm long, and 3 mm broad.

The are pure pale blue, 15–25 mm in diameter, with five petals. The is a round, dry capsule 5–9 mm in diameter, containing several glossy brown shaped like an pip, 4–7 mm long.


History
The earliest evidence of humans using wild flax as a comes from the present-day Republic of Georgia, where spun, dyed, and knotted wild flax fibers found in date to the Upper Paleolithic, 30,000 years ago. Humans first domesticated flax in the region. Evidence exists of a domesticated oilseed flax with increased seed-size by 9,000 years ago from in . Use of the crop steadily spread, reaching as far as and by 5,000 years ago.Barber E. (1991) "Prehistoric Textiles: The Development of Cloth in the Neolithic and Bronze Ages with Special Reference to the Aegean". Princeton University Press, p.12 In China and India, domesticated flax was cultivated at least 5,000 years ago.Cullis C. (2007) "Oilseeds" Springer, p. 275

Flax was cultivated extensively in , where the temple walls had paintings of flowering flax, and mummies were embalmed using linen.Sekhri S. (2011) "Textbook of Fabric Science: Fundamentals to Finishing". PHI Learning Private Limited, New Delhi, p. 76 Egyptian priests wore only linen, as flax was considered a symbol of purity.Wisseman S. (2013) "Ancient Technologies and Archaeological Materials". Routledge, p. 124 traded Egyptian linen throughout the and the used it for their .Buchanan R. (2012) "A Weaver's Garden: Growing Plants for Natural Dyes and Fibers". Courier Dover Publications, p. 22 As the declined, so did flax production. But with laws designed to publicize the of linen textiles and the health of linseed oil, revived the crop in the eighth century CE.Wisseman S., p.125 Eventually, became the major center of the European linen industry in the . In North America, colonists introduced flax, and it flourished there,Cullis C. p.275 but by the early 20th century, cheap and rising farm wages had caused production of flax to become concentrated in northern Russia, which came to provide 90% of the world's output. Since then, flax has lost its importance as a , due to the easy availability of more durable fibres. (2003) "The Oxford Encyclopedia of Economic History, Volume 1" Oxford University Press, p.303.


Uses
Flax is grown for its seeds, which can be ground into a meal or turned into , a product used as a nutritional supplement and as an ingredient in many products. Flax is also grown as an in gardens. Moreover, flax fibers are used to make . The , usitatissimum, means "most useful".
(1990). 9783642744501

Flax fibers taken from the stem of the plant are two to three times as strong as cotton fibers. Additionally, flax fibers are naturally smooth and straight. Europe and North America both depended on flax for plant-based cloth until the 19th century, when cotton overtook flax as the most common plant for making . Flax is grown on the Canadian for linseed oil, which is used as a drying oil in paints and varnishes and in products such as and .

Linseed meal, the by-product of producing linseed oil from flax seeds, is used as fodder.Heuzé V., Tran G., Nozière P., Lessire M., Lebas F., 2017. Linseed meal. Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. Last updated on February 16, 2017, 16:31


Flaxseeds
Flaxseeds occur in two basic varieties/colors: brown or yellow (golden linseeds). Most types of these basic varieties have similar characteristics and equal numbers of short-chain omega-3 fatty acids. An exception is a type of yellow flax called solin ( ""), CRS Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition - Order Code 97-905 which has a completely different oil profile and is very low in omega-3s (alpha-linolenic acid (ALA), specifically).

Flaxseeds produce a known as flaxseed oil or , which is one of the oldest commercial oils. It is an obtained by expeller pressing and sometimes followed by solvent extraction. Solvent-processed flaxseed oil has been used for many centuries as a in painting and varnishing.

Although brown flaxseed varieties may be consumed as readily as the yellow ones, and have been for thousands of years, its better-known uses are in paints, for fiber, and for cattle feed.


Culinary
A 100-gram portion of ground flaxseed supplies about , 41 g of fat, 28 g of fiber, and 20 g of protein. Whole flaxseeds are chemically stable, but ground flaxseed meal, because of , may go when left exposed to air at room temperature in as little as one week. Refrigeration and storage in sealed containers will keep ground flaxseed meal for a longer period before it turns rancid. Under conditions similar to those found in commercial bakeries, trained sensory panelists could not detect differences between bread made with freshly ground flaxseed and bread made with flaxseed that had been milled four months earlier and stored at room temperature. If packed immediately without exposure to air and light, milled flaxseed is stable against excessive oxidation when stored for nine months at room temperature, and under conditions, for 20 months at ambient temperatures.

Three — secoisolariciresinol diglucoside, glucoside, and glucoside — are present in commercial breads containing flaxseed.


Fodder
After crushing the seeds to extract linseed oil, the resultant linseed meal is a -rich for , , and fish. It is also often used as feed for and , and has also been used in horse concentrate and . The high omega-3 fatty acid (ALA) content of linseed meal "softens" milk, eggs or meat, which means it causes a higher content and thus lowers its storage time. The high omega-3 content also has a further disadvantage, because this fatty acid and goes quickly, which shortens the storage time. was developed in Australia and introduced in the 1990s with less omega-3, specifically to serve as . Another disadvantage of the meal and seed is that it contains a vitamin B6 () antagonist, and may require this vitamin be supplemented, especially in , and furthermore linseeds contain 2-7% of (fibre), which may be beneficial in humans and cattle, but cannot be digested by non-ruminants and can be detrimental to young animals, unless possibly treated with .

Linseed meal is added to as a protein supplement. It can only be added at low percentages due to the high fat content, which is unhealthy for ruminants. Compared to oilseed meal from it measures as having lower nutrient values, however, good results are obtained in cattle, perhaps due to the mucilage, which may aid in slowing digestion and thus allowing more time to absorb nutrients. One study found that feeding flax seeds may increase omega-3 content in , while another found no differences. It might also act as a substitute to in increasing . In the US, flax-based feed for ruminants is often somewhat more expensive than other feeds on a nutrient basis. feeding on low quality are able to eat a large amount of linseed meal, up to 40% in one test, with positive consequences. It has been fed as supplement to in India, and provided a better diet than forage alone, but not as good as when substituted with meal. It is considered an inferior protein supplement for swine because of its fibre, the vitamin antagonist, the high omega-3 content and its low lysine content, and can only be used in small amounts in the feed. Although it may increase the omega-3 content in eggs and meat, it is also an inferior and potentially toxic feed for poultry, although it can be used in small amounts. The meal is an adequate and traditional source of protein for rabbits at 8-10%. Its use in fish feeds is limited.

Raw, immature linseeds contain an amount of compounds and can be dangerous for animals such as horses or rabbits. Boiling removes the danger. This is not an issue in meal cake due to the processing temperature during oil extraction.

Flax left over from the harvesting of oilseed is not very nutritious; it is tough and indigestible, and is not recommended to use as ruminant fodder, although it may be used as bedding or as .


Flax fibers
Flax fiber is extracted from the bast beneath the surface of the stem of the flax plant. Flax fiber is soft, lustrous, and flexible; bundles of fiber have the appearance of blonde hair, hence the description "flaxen" hair. It is stronger than cotton fiber, but less elastic.

The use of flax fibers dates back tens of thousands of years; , a refined textile made from flax fibers, was worn widely by priests more than 4,000 years ago.The Sumerians: Their history, culture and character, Samuel Noah Kramer, pg.104, Industrial-scale flax fiber processing existed in antiquity. A factory dedicated to flax processing was discovered in , Greece.

(2015). 9789606878947, Kapon Editions.

The best grades are used for fabrics such as , , and . Coarser grades are used for the manufacturing of and , and historically, for and webbing equipment. Flax fiber is a raw material used in the high-quality paper industry for the use of printed , for , and .

(2020). 9781845695057, Woodhead Publishing.

for spinning flaxen were invented by John Kendrew and of , , in 1787.

(1967). 9780714611143, Routledge.
New methods of processing flax have led to renewed interest in the use of flax as an industrial fiber.


Nutrition
In a 100-gram serving, flaxseed contains high levels (> 19% of the , DV) of , , several , and . Ten grams of flaxseed contains one gram of water-soluble fiber (which lowers blood cholesterol) and three grams of insoluble fiber (which helps prevent constipation). Flax contains hundreds of times more than other plant foods. Flaxseeds are especially rich in , , , and (DVs above 90%).

As a percentage of total , flaxseeds contain 54% omega-3 fatty acids (mostly ALA), 18% omega-9 fatty acids (), and 6% omega-6 fatty acids (); the seeds contain 9% , including 5% as . Flaxseed oil contains 53% 18:3 omega-3 fatty acids (mostly ALA) and 13% 18:2 omega-6 fatty acids.


Health effects
One study of research published between 1990 and 2008 showed that consuming flaxseed or its derivatives may reduce total and in the blood, with greater benefits in women and those with high .

A has shown that consumption of more than 30 g of flaxseed daily for more than 12 weeks reduced body weight, body mass index (BMI), and waist circumference for persons with a BMI greater than 27. Another meta-analysis has shown that consumption of flaxseed for more than 12 weeks produced small reductions in and . Flaxseed supplementation showed a small reduction in c-reactive protein (a marker of inflammation) only in persons with a BMI greater than 30.


Linseed oil

Toxicity
Flaxseed and its oil have repeatedly been demonstrated to be nontoxic and are generally recognized as safe for human consumption. Like many common foods, flax contains small amounts of cyanogenic , which is nontoxic when consumed in typical amounts, but may be toxic when consumed in large quantities as with such as . Typical concentrations (for example, 0.48% in a sample of defatted dehusked flaxseed meal) can be removed by special processing.


Cultivation
The most suitable for flax, besides the kind, are deep containing a large proportion of . Flax is often found growing just above the waterline in bogs. Heavy are unsuitable, as are soils of a or dry nature. Farming flax requires few or . Within eight weeks of sowing, the plant can reach in height, reaching within 50 days.


Diseases

Production
In 2018, world production of flax (linseed) was 3.2 million , led by with 29% of the total. Other major producers were , , and (table).

933,533
688,784
557,888
365,511
3,182,754
Source: of the


Harvesting

Maturation
Flax is harvested for fiber production after about 100 days, or a month after the plants flower and two weeks after the seed capsules form. The bases of the plants begin to turn yellow. If the plants are still green, the seed will not be useful, and the fiber will be underdeveloped. The fiber degrades once the plants turn brown.

Flax grown for seed is allowed to mature until the seed capsules are yellow and just starting to split; it is then harvested in various ways. A combine harvester may either cut only the heads of the plants, or the whole plant. These are then dried to extract the seed. The amount of weeds in the straw affects its marketability, and this, coupled with market prices, determines whether the farmer chooses to harvest the flax straw. If the flax straw is not harvested, typically, it is burned, since the stalks are quite tough and decompose slowly ( i.e., not in a single season). Formed into from the harvesting process, the straw often clogs up tillage and planting equipment. Flax straw that is not of sufficient quality for fiber uses can be baled to build shelters for farm animals, or sold as biofuel, or removed from the field in the spring.

Two ways are used to harvest flax fiber, one involving mechanized equipment (combines), and a second method, more manual and targeting maximum fiber length.


Harvesting for fiber

Mechanical
Flax for fiber production is usually harvested by a specialized flax harvester. Usually built on the same machine base as a combine, but instead of the cutting head it has a flax puller. The flax plant turned over and is gripped by rubber belts roughly 20–25 cm (8-10") above ground, to avoid getting grasses and weeds in the flax. The rubber belts then pull the whole plant out of the ground with the roots so the whole length of the plant fiber can be used. The plants then pass over the machine and is placed on the field crosswise to the harvesters direction of travel. The plants are left in the field for field retting.

The mature plant can also be cut with mowing equipment, similar to hay harvesting, and raked into windrows. When dried sufficiently, a combine then harvests the seeds similar to wheat or oat harvesting .


Manual
The plant is pulled up with the roots (not cut), so as to increase the fiber length. After this, the flax is allowed to dry, the seeds are removed, and it is then . Dependent upon climatic conditions, characteristics of the sown flax and fields, the flax remains on the ground between two weeks and two months for retting. As a result of alternating rain and the sun, an enzymatic action degrades the pectins which bind fibers to the straw. The farmers turn over the straw during retting to evenly rett the stalks. When the straw is retted and sufficiently dry, it is rolled up. It is then stored by farmers before extracting the fibers.


Processing
is the process of removing the seeds from the rest of the plant. Separating the usable flax fibers from other components requires pulling the stems through a hackle and/or beating the plants to break them.

Flax processing is divided into two parts: the first part is generally done by the farmer, to bring the flax fiber into a fit state for general or common purposes. This can be performed by three machines: one for threshing out the seed, one for breaking and separating the straw (stem) from the fiber, and one for further separating the broken straw and matter from the fiber.

The second part of the process brings the flax into a state for the very finest purposes, such as , , , and very fine . This second part is performed by a refining machine.


Preparation for spinning
Before the flax fibers can be spun into linen, they must be separated from the rest of the stalk. The first step in this process is , which is the process of rotting away the inner stalk, leaving the outer parts intact. At this point, straw, or coarse outer stem (cortex and epidermis), is still remaining. To remove this, the flax is "broken", the straw is broken up into small, short bits, while the actual fiber is left unharmed. scrapes the outer straw from the fiber. The stems are then pulled through "hackles", which act like combs to remove the straw and some shorter fibers out of the long fiber.


Retting flax
Several methods are used for flax. It can be retted in a pond, stream, field, or tank. When the retting is complete, the bundles of flax feel soft and slimy, and quite a few fibers are standing out from the stalks. When wrapped around a finger, the inner woody part springs away from the fibers. Pond retting is the fastest. It consists of placing the flax in a pool of water which will not evaporate. It generally takes place in a shallow pool which will warm up dramatically in the sun; the process may take from a few days to a few weeks. Pond-retted flax is traditionally considered of lower quality, possibly because the product can become dirty, and is easily over-retted, damaging the fiber. This form of retting also produces quite an odor. Stream retting is similar to pool retting, but the flax is submerged in bundles in a stream or river. This generally takes two or three weeks longer than pond retting, but the end product is less likely to be dirty, does not smell as bad, and because the water is cooler, is less likely to be over-retted. Both pond and stream retting were traditionally used less because they pollute the waters used for the process.

In field retting, the flax is laid out in a large field, and dew is allowed to collect on it. This process normally takes a month or more, but is generally considered to provide the highest quality flax fibers, and it produces the least pollution.

(2020). 9789385059094, Woodhead Publishing India PVT LTD (2017 Revised edition).

Retting can also be done in a plastic trash can or any type of water-tight container of wood, concrete, earthenware, or plastic. Metal containers will not work, as an acid is produced when retting, and it would the metal. If the water temperature is kept at , the retting process under these conditions takes 4 or 5 days. If the water is any colder, it takes longer. Scum collects at the top, and an odor is given off the same as in pond retting. 'Enzymatic' retting of flax has been researched as a technique to engineer fibers with specific properties.


Dressing the flax
File:Harfleur - Compagnons duellistes - teillage du lin.jpg|Breaking flax File:Harfleur - Compagnons duellistes - battage du lin.jpg|Scutching flax File:Harfleur - Compagnons duellistes - peignage du lin.jpg|Heckling flax File:Flax fibers.JPG|Flax fiber in different forms, before and after processing Dressing the flax is the process of removing the straw from the fibers. Dressing consists of three steps: breaking, scutching, and heckling. The breaking breaks up the straw. Some of the straw is scraped from the fibers in the scutching process, and finally, the fiber is pulled through heckles to remove the last bits of straw.

Breaking breaks up the straw into short segments.

removes some of the from the fiber.

Heckling is pulling the fiber through various sizes of or heckles. A heckle is a bed of "nails"—sharp, long-tapered, tempered, polished steel pins driven into wooden blocks at regular spacing.


Genetically modified flax contamination
In September 2009, Canadian flax exports reportedly had been contaminated by a deregistered genetically modified cultivar called 'Triffid' that had food and feed safety approval in Canada and the U.S., however, Canadian growers and the Flax Council of Canada raised concerns about the marketability of this cultivar in Europe where a policy exists regarding unapproved genetically modified organisms. Subsequently, deregistered in 2010 and never grown commercially in Canada or the U.S., 'Triffid' stores were destroyed, but future exports and further tests at the University of Saskatchewan proved that 'Triffid' persisted among flax crops, possibly affecting future crops. Canadian flaxseed cultivars were reconstituted with 'Triffid'-free seed used to plant the 2014 crop. Laboratories are certified to test for the presence of 'Triffid' at a level of one seed in 10,000.


Symbolic images
Flax is the emblem of and displayed by the Northern Ireland Assembly. In a coronet, it appeared on the reverse of the British one-pound coin to represent Northern Ireland on coins minted in 1986, 1991, and 2014. Flax also represents Northern Ireland on the badge of the Supreme Court of the United Kingdom and on various logos associated with it.

Common flax is the national flower of .

In early versions of the tale, such as "Sun, Moon, and Talia" by Giambattista Basile, the princess pricks her finger, not on a spindle, but on a sliver of flax, which later is sucked out by her children conceived as she sleeps.


See also

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