
Cogongrass in blossom in winter. Photo by Green Deane

Cogongraass blossoms. Photo by Green Deane
It is perhaps the most invasive grass species in the world, Cogongrass, Imperata cylindrica, and is on the list of the top ten most invasive plants on the planet. Where I live there are fields of the stuff. Florida has a million acres of cogongrass. It infests a billion acres worldwide. Spreading by seed and rhizomes Cogongrass invades 35 different crops including rice, cotton, coffee, tea, oil palm, coconut and rubber plantations. Some animals will eat it but don’t like to because it’s edges are cutting sharp, like saw grass. Cogongrass is hostile to man and animal alike. Even goats, the garbage disposals of the animal kingdom won’t eat it. Starving cattle will but only when it is young before it develops sharp edges. Pigs, however, relish its roots (60% of its biomass is underground.) Humans can tackle it in various ways. As Cornucopia II says on page 177:
“Immature flower spikes are sucked or eaten They are sometime cooked as a potherb, fried, or put into soups. The slightly sweet rhizomes are chewed or eaten and yield a starch used in making beer. They are often mixed with a purple variety of sugar cane to form a cooling thirst-quenching, digestive beverage which is occasionally available in Asian markets.”
I would add a warning: The blades have small silica crystals which as dust could injure your lungs. Thus if harvesting or destroying a lot of it a mask might be appropriate.

Orseolia javanica, female left, male right.
How Cogongrass got from Eastern Asia to America is a bit of an argument. Some say by accident in 1912 via Louisiana, others say through Grand Bay, Alabama, that same year as packing material for Satsuma oranges from Japan. What we do know for certain is that the U.S. government imported it intentionally in the 1930s and 1940’s, for fodder and erosion control (like Kudzu). It now infests Florida, Alabama and Mississippi, with pockets from Virginia to Texas. Thus Imperata cylindrica is a Federal Noxious Weed under the Plant Protection Act. It cannot not be imported or transported between States without first getting a federal permit. It is classified as a noxious weed in Florida, Alabama, Mississippi, North Carolina, South Carolina, Georgia and Hawaii. Seventy-five percent of the land in Alabama is infested with it. Around 2017 researchers imported an Indonesian gall-making midge, Orseolia javanica that destroys cogongrass but was a failure. The fly refused to have sex so far from home, and is also food for other insects.

Imperata cylindrica Rubra, aka Rubra. It can revert back to the invasive species.
An ornamental variety, Rubra (Red Baron, Japanese Blood Grass) left, is shorter and less invasive. The upper part of each blade of that variety turns dark red in summer, growing darker as the season progresses. ‘Rubra’ may not be legally grown, sold or given away in the State of Alabama.
An aggressive colony-forming perennial grass two to six feet tall, Cogongrass is Round Up resistant. Oddly this invasive species will grow near Black Walnut which chemically usually discourages other plants from growing near it. And like Black Walnut, Australian Pines and Brazilian pepper, Cogongrass has an allelopathic effect on the germination and growth of other plants, readily killing pine seedlings. Cogongrass does not survive deep tilling.

Acres of cogongrass in winter. Photo by Green Deane
Other countries the species is found in include Oman, Saudi Arabia, Yemen, Afghanistan, Cyprus, Egypt (Sinai), Iran, Iraq, Israel, Jordan, Lebanon, Syria, Turkey, Armenia, Azerbaijan, Georgia, Russian Federation (Dagestan), Kazakhstan, Kyrgyzstan, Turkmenistan, Uzbekistan, China, Korea, Japan (Hokkaidô, Honshu, Kyushu, Ryukyu Islands, Shikoku) Bhutan, India, Sri Lanka, Nepal, Pakistan, Papua New Guinea, Cambodia, Laos, Myanmar, Thailand, Vietnam, Indonesia, Malaysia, the Philippines, Australia (Tasmania, New South Wales, Queensland, South Australia, Victoria, Western Australia (northeast), Northern Territory) Albania, Bulgaria, Greece (including Crete), Croatia, Italy (including Sardinia, Sicily), Slovenia, Spain (including Baleares), France (Corsica), Portugal, Spain (Canarias), Portugal (Madeira Islands), Algeria, Egypt, Libya, Morocco, Tunisia, Eritrea, Ethiopia, Sudan, Chad, Kenya, Tanzania, Uganda, Burundi, Central African Republic, Cameroon, Democratic Republic of the Congo, Congo, Gabon, Rwanda, Benin, Burkina Faso, Côte D‘Ivoire, Ghana, Guinea, Gambia, Guinea-Bissau, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone, Togo, Angola, Mozambique, Malawi, Zambia, Zimbabwe, Botswana, Lesotho, Namibia, Eswatini, South Africa (Cape Province, Free State, KwaZulu-Natal, and Transvaal.)
Other names include Chinese Silver Grass, Nut Grass, India Goosegrass, and pay mao. Speargrass, imperata, cogon grass, alang-alang, kunai grass, lalang, blade grass, blady grass, cottonwool grass, woolly grass, thatch grass, silver spike, Herbe à paillotte, paillotte, impérate, chiendent, paille de dys, Sapé, caminhadora, capin and seno,

Blossom with seeds and blade, the blade has an offset whitish midrib. Photo by Green Deane
Nutrients in Cogongrass include crude fiber, carbohydrates, sugars, fatty acid, and trace elements. The carbohydrates and sugars provide energy and add flavor to plants, revealing the potential of the species as functional food. Calcium, Sodium, Magnesium, Iron, and Potassium are the main trace elements in the plant [3].There also are some coumarins. While food uses for humans are rather limited, that plant has a long history in folk medicine. (Note: I am not an herbalist.)
Modern pharmacology reports that several substances from I. cylindrica. exhibit a wide range of biological activities such as hemostasis, improvement of urination, anti-inflammatory, antibacterial, anticancer, and enhancement of the immune system. The flowers and the roots are antibacterial, diuretic, febrifuge, typic and sialagogic (promotes the secretion of saliva.). It is often used in traditional Chinese and African medicine for its diuretic and anti-inflammatory properties.

Cogongrass roots. Photo by Green Deane
The root is astringent, antifebrile, antivinous, diuretic, emollient, haemostatic, and restorative. It is used in the treatment of nose bleeds, haematuria, haematemesis, oedema and jaundice. The root has antibacterial action against Staphylococcus aureus, Bacillus dysenteriae et cetera. A decoction of the root is used as an anthelmintic and also to treat digestive disorders such as indigestion, diarrhea and dysentery. The root bark is febrifuge, and restorative. Extracts of the plant have shown viricidal and anticancer activity. A water extract of stem and leaves has shown some anti-tumor activity against sarcoma and adenocarcinoma in mice. Rhizome extracts significantly inhibited urination in rats. Antiviral, antihepatotoxic, antihypertensive, antihistamine and larvicidal activities are also reported.

Ferrante Imperato
In dead Latin Imperata means imperial, commanding and cylindrica means cylindrical, tubular. The species was named for a 16th century pharmacist in Naples, “Ferrante Imperato” (1550-1625) who wrote an early book on nature, Dell’Historia Naturala, 1599. His motto was. “In dies auctior” (“I improve day by day.”) Among his accomplishments was to be the first to identify how fossils are created.
GREEN DEANE’S ITEMIZATION
Identification
Imperata cylindrica is a perennial growing to six feet at a slow rate.
It is hardy to USA zones 6-9 though is frost tender. The species is hermaphrodite (has both male and female organs) and is pollinated by Wind. The leaf blades have a whitish midvein that is clearly offset to one side, and serrated (toothed) edges. The roots, actually rhizomes, are hard, scaly and cream-colored with sharply pointed tips. Pigs like to eat them. The seed head is fuzzy, white and plume-like 2-8 inches long. The plant does not appear to have a stem, with leaves appearing to rise directly from the ground. Overlapping sheaths give the plant base a rounded appearance. A related species, Brazilian satintail, is native to southern North America, Central America, and South America.
Time of year
In flower from March to mid-June in some areas, August to September in other places, seeds — some 3,000 per plants — ripen from September to October, usually germinating within three to four weeks after ripening.
Environment
Can grow in sandy, loamy and heavy clay soils, prefers to be well-drained and can grow in nutritionally poor soil. Prefers mildly acidic, neutral and mildly alkaline soils. It cannot grow in the shade and prefers dry or moist soil. It is drought tolerant and can tolerate sea exposure. The species is resistant to fire. Burning while affecting the above-ground parts of the plant, usually does not damage the rhizomes. Will grow up to an elevation of 20,000 feet.
Method of preparation
Young blossoms eaten raw or cooked, rhizomes (roots) boiled or chewed. There can be 17 tons of roots per acre (perhaps a way to fatten hogs.) Seeds edible but tiny. Plant ash is used for a salt substitute.
Also the leaves are woven to make mats, bags and raincoats. Inflorescences are valued for stuffing pillows and cushions, Stems are used in thatching roofs, fiber from the leaves is used in making paper, brushes and rope.









