Forest Preserve District of Cook County, Illinois
Nature Bulletins
Newton Home Page

Introduction and Instructions

Search Engine

Table of Contents

Copyright

Disclaimer

Hemp
Nature Bulletin No. 358-A   November 15, 1969
Forest Preserve District of Cook County
George W. Dunne, President
Roland F. Eisenbeis, Supt. of Conservation

HEMP
Primitive man probably made his first ropes and cords from animal sinews. strips of hide, or the tough shoots of plants. Eventually, like the American Indian, he learned to use plant fibers. Today, the principal fiber plants are cotton, flax, hemp, manila hemp, sisal hemp and jute.

Soft Hemp, a native of India and Persia, has been cultivated in China since 2800 BC It reached western Europe about 500 AD and, for centuries was one of the most important textile fibers. The first colonists brought hemp to America. From it were woven the homespun garments of our pioneers and the tops of their covered wagons. Kentucky was once one of the leading hemp producing regions in the world but, today, this has become a minor crop in the United States. It is produced largely in Russia, Poland, Hungary, Italy, India and China. Other fibers, natural or synthetic, have replaced it.

Soft hemp, or Marijuana, is the only true hemp. It is an annual plant of the Mulberry Family, closely related to hops and nettles but having the general appearance of the giant ragweed. A great deal of confusion has arisen because the name "hemp" has been borrowed to label several other fiber-yielding but unrelated plants, Manila hemp, or Abaca, comes from the Philippines and greatly resembles its close cousin, the banana plant. It is used for the better grades of rope because its hard fibers are lighter, stronger and more resistant to water than those of soft hemp. Sisal hemp and Henequen, two species related to the century plant and native in Central America, are used for the cheaper grades of rope, binder twine, wrapping twine, nets, etc. Sunn hemp, native and widely grown in India, is used for coarse cloth and burlap sacks, like jute. Bowstring hemp or sansevieria, is the "snake plant" so common in our homes and hotel lobbies.

Hemp does best on rich river bottoms but has escaped to grow wild in many places. When sown thickly for a fiber crop, it may be from 5 to 12 feet tall with stalks one-half inch or less in diameter. Planted in hills, for seed, the stalks may be two inches thick and 20 feet tall. Each leaf has from 5 to 11 slender toothed leaflets like the fingers on a human hand. me inconspicuous flowers at the top of the stalk are of two types, born on separated plants.

When the stalks are harvested for fiber, preferably when in full bloom and by special machines, they are allowed to dry in shocks or in stacks. men, in the United States and Russia, they are spread on the ground to absorb rain and dew; in other countries they are usually soaked in ponds or artificial tanks. This "retting" or rotting separates the fibers -- from 4 to 8 feet long -- from the outer bark and the woody inner shell, as well as from each other. me remaining processes, such as rolling and "scutching" or combing, are similar to those used on flax.

The "line" or long fibers are used to make rope, cordage, durable twines, carpet yarns and thread, upholstery webbing and bolt webbing. me short fibers, or "tow", are tarred to make oakum for caulking boats and pipejoints. Oil from the seeds are used in soaps, paints and varnishes. The seeds are fed to poultry, caged birds, and furnish winter food for game birds. me flowers and upper leaves, dried and smoked, contain a dangerous habit forming narcotic known as marijuana in America, ganja in India, and Hashish in the Middle East.


To return to the Nature Bulletins Click Here!
Hosted by NEWTON

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs

NEWTON AND ASK A SCIENTIST
Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Sponsered by Argonne National Labs