Hemp fiber

Where Found

Hemp, Cannabis sativa, is indigenous to temperate regions in Asia. All major industrialized countries but the United States cultivate hemp for its fibers and oil-rich seeds. The former Soviet Union was the world’s leading producer until the 1980s. As of 2024, China was the largest producer, with other significant industries in Canada, the United States, France, and Chile.

Primary Uses

Cannabis was initially spread around the world because of its fiber, not its intoxicant chemicals or its nutritious oil seeds. It is one of the oldest sources of textile fiber, whose use for cloth can be traced to 8000 BCE in China and the Middle East. Hemp fiber is also used for the manufacture of cordage, sail cloth, and fish nets, as well as specialized types of plastics and building materials. Oil extracted from seeds is used in paints, medicines, and foods, and the seeds themselves may be used as food as well.

Technical Definition

Cannabis sativa is a multipurpose plant that has long been cultivated for its (bast) fiber in the stem, versatile oil in the seeds, and a resin secreted by its leaves that contains a compound, tetrahydrocannabinol (THC), known to have psychotropic effects. The somewhat confusing common names hemp and marijuana have been applied loosely to all three forms of Cannabis sativa. However, this essay focuses primarily on its fiber and seed uses. The plants are dioecious annual herbs that produce fibers of the best quality when cultivated under temperate and warm conditions. Hemp produces the longest bast fiber among plants. Its seeds are rich in oil, which may be extracted and used in a variety of products.

Description, Distribution, and Forms

Cannabis is the generic name for hemp, a highly adaptive and successful species cultivated throughout temperate and tropical regions across the globe. The classification of Cannabis has been a source of much controversy for a long time. It was first thought to be a relative of the nettle and later considered a member of the Moraceae family. Finally, Cannabis was classified into its own family, Cannabaceae, which includes the genera Cannabis and Humulus lupulus (hops). It was first named in 1753 by Swedish botanist Carl Linnaeus as Cannabis sativa, meaning “useful hemp” in Latin.

More confusion concerning the taxonomy of Cannabis resulted from the naming of two other closely related “species.” The name Cannabis indica was applied to hemp plants in India by French naturalist and biologist Jean-Baptiste Lamarck, and a Russian botanist used the name Cannabis ruderalis for wild Cannabis plants he observed in western Siberia and central Asia. Even today, some still doubt that Cannabis sativa and Cannabis indica are two different species.

Nevertheless, Cannabis sativa is the most widespread among the three. It is a tall, thin annual that grows to 1.5 to 4.5 meters (5 to 14.5 feet) tall, with most leaves concentrated at the top. The leaves are dark green in color, and each consists of five to nine serrated, tapering leaflets with sharp ends, measuring 5 to 13 centimeters (2 to 5 inches) long and 0.76 to 2 centimeters (0.3 to 0.75 inches) wide. The stem is angular, hollow, branched on top, and covered by fine hairs. Plants can grow in both loamy soil and poor sandy soil. They can grow in altitudes as high as 2,500 meters (1.5 miles). Cannabis requires plenty of light and is less tolerant of low temperatures. Male plants are generally taller than female ones. Male flowers also bloom two to four weeks earlier than female flowers and are small, with colors ranging from pale green, yellow, and brown to purple-red. Female flowers are bundled tightly together into clusters.

Cultivating Cannabis sativa is easy. Seeds are planted 15 to 20 centimeters (6 to 7.5 inches) apart. Plants grow quickly, up to 15 centimeters (6 inches) a day, with an average daily growth of 2 to 5 centimeters (0.75 to 2 inches) in height. Fruits (achenes) mature 10 to 35 days after fertilization, each containing one seed. The entire life cycle can be completed within 70 to 110 days. Cannabis sativa can grow in almost any soil, requiring little fertilizer, and is resistant to pests and tolerant to weeds. Hemp cultivation and processing was one of the world’s most significant industries until the mid-1800s. The labor-intensive work of harvesting and extracting fibers from the stalk, combined with the emergence of more easily extracted fiber sources such as cotton and jute, doomed hemp’s status as the top fiber crop.

History

Cannabis is generally believed to have originated from the temperate regions of central Asia, near the Irtysh River, along the edge of the Gobi Desert, or the Taklimakan Desert in China’s Xinjiang Uygur Province, north of Tibet. Hemp cultivation and use date back to prehistoric times in the Middle East and China, where the fiber was used for textiles, the seeds for food, and the oil for various products. Hemp fiber imprints found in pottery shards in Taiwan were dated to about 8000 BCE. Later ancient Asian societies used hemp fibers to make clothes, shoes, ropes, and a primitive form of paper. Evidence for such uses was uncovered at the Great Wall of China and dates back as far as 10,200 years.

Hemp was introduced to western Asia and Egypt and, subsequently, to Europe between 1000 and 2000 BCE. Extensive hemp cultivation in Europe began around 500 BCE. From 1500 to 1700 CE, hemp (along with flax) was the major fiber crop in Russia and Europe. In 1545, the Spanish brought hemp to South America (Chile). The earliest cultivation of hemp in North America occurred in 1606 by French botanist Louis Hébert at Port Royal, Acadia (now in Nova Scotia). Hemp was first grown in New England by Puritans in 1645. By 1850, hemp was the third-largest crop in the United States.

Obtaining Hemp

Hemp is raised and harvested in temperate regions. During harvest, seeds are separated from the stalks, which have had their leaves stripped off. The stalks are then processed to extract fibers through retting, pounding, and scutching. Retting begins with submerging the flax stems in water and ends with bacteria rotting away cellular tissues and gummy substances, leaving the outer fibers intact. Following retting, the stalk is pounded and broken up into short bits, leaving the fiber unharmed. The scutching acts to comb nonfiber residues out of the fiber.

Following these steps, the well-processed hemp fiber appears creamy white and soft and has a silky sheen. Hemp fiber so extracted was used by Levi Strauss to make the original set of jeans. However, most hemp fiber is extracted as quickly and inexpensively as possible. As a result, hemp is mostly used for cordage, rope, canvas, and sailcloth. Fibers for human cloth, including jeans, are obtained primarily from cotton.

Uses of Hemp

All parts of Cannabis plants are useful. For centuries, Cannabis has been the source of a versatile natural fiber and oil-rich seeds. Major uses of industrial hemp include, but are not limited to, body care products, construction, essential oils, food, livestock bedding and feed, medicines, molded plastics, nutritional supplements, paper products, and textiles.

Hemp oil contains omega-3, -6, and -9 fatty acids, which nourish skin and thus can be included in many cosmetic products, such as baby moisturizer, facial cream, shaving cream, shampoo, and conditioner. For construction, hemp plants can be used to make caulking, cement, fiberboard, flooring, insulation, paneling, plaster, plywood, and roofing. Hemp oil can be used to produce nontoxic paint, varnish, and detergent. The essential oil is used as an emulsion in medicines and is a key ingredient in nutritional supplements. More importantly, hemp seeds contain high levels of protein and essential fatty acids, making hemp a premier food source.

The plant residues that remain after harvest and processing are an excellent source of animal bedding. The meal left after oil extraction from seeds contains 30 percent proteins, carbohydrates, and mineral nutrients and is often used as feed for livestock. Because of its high biomass production across a wide range of habitats, hemp has significant potential as a biofuel source, either ethanol or biodiesel.

Above all, however, is the versatility of hemp fiber. Hemp fiber has been valued for three characteristics: length, strength, and durability. The primary bast fibers in the bark can reach up to 40 millimeters (1.5 inches) long, making it a great raw material for papers, clothing, and textiles. The use of hemp fibers in cloth was more common than that of linen until the fourteenth century. Hemp paper is bleached with hydrogen peroxide, a much more environmentally friendly chemical than chlorine bleach, which is required by tree-based paper mills and heavily pollutes water sources. By the 1820s, hemp fibers were used to make 90 percent of the canvas sails, caulk, fish nets, and rigging for ships because of their strength and resistance to decay and salt water. Hemp was considered to provide the very best canvas for painting. Estimates indicate that five thousand textile products and as many as twenty-five thousand other products could be produced using hemp for a global market.

Legal Issues

Because hemp and marijuana are both produced from varieties of cannabis, US drug enforcement laws have restricted the growth of cannabis and the production of hemp in the United States. Hemp byproducts and finished goods imported to the United States must meet controlled substance standards. However, the twenty-first century saw a gradual easing of these restrictions, paralleling the movement towards the legalization of marijuana. In 1999, Hawaii was granted the ability to research hemp production with federal oversight. This led to several other states considering legislation regarding industrial hemp and increased public awareness of the issue. In 2013, an industrial hemp harvest in Colorado was the first of its kind recorded in the United States since the 1950s.

The federal Agricultural Act of 2014, passed by Congress and signed by President Barack Obama, officially allowed further research groups and state agricultural departments to grow industrial strains of cannabis for hemp production in those states that had already legalized hemp, and protected them from prosecution by federal law enforcement. The 2015 Industrial Hemp Farming Act aimed to fully distinguish industrial hemp from marijuana, removing controlled substance restrictions, but the bill did not pass. Supporters of hemp production in the United States, a bipartisan group, claimed that the industry would boost agriculture and fuel growth in the domestic market for hemp products, replacing imports from China and Canada. Incorporating key provisions of the 2015 Industrial Hemp Farming Act, the Agriculture Improvement Act of 2018 (the 2018 Farm Bill) defined hemp as any part of the Cannabis sativa L. plant containing less than 0.3 percent Delta-9 THC and directed the US Department of Agriculture (USDA) to develop a national regulatory framework for the nation's hemp production. In 2019, the USDA published an interim final rule on the subject and established the Domestic Hemp Production Program; in 2021, the agency published the final rule concerning regulations and hemp production in the US.

By the mid-2020s, 300,000 people worked in the American hemp industry, which generated around $28 billion annually. However, in November 2025, just before the Senate voted on the spending bill that ended the forty-three-day government shutdown (the longest in history), Senator Mitch McConnell added legislation to modify the federal definition of hemp to include total THC rather than only Delta-9, as outlined in 2018. This banned all hemp products with 0.4 milligrams or more of total THC, which critics argued effectively banned more than 90 percent of all hemp products. The legislation also required the Drug Enforcement Agency to test all hemp products. Some asserted that the law would likely be re-evaluated before its January 2026 implementation date.

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