Freshwater and moderately brackish sites, estuaries, damp habitats, dune lakes and hollows and wetlands, and can also grow in dry pastures, crops and urban areas. Excluding stock from infested areas, lowering the light levels and nutrient runoff by planting along waterways can help in the ongoing management of alligator weed sites. Note: Chemical control should only be used as a last resort, as organic approaches are safer and much more environmentally friendly. Pink, soft, hollow stems (<10 m long) root at nodes, creep along ground, or float on water with tips standing upright and forming dense stands or rafts. It is an ecological, economic and biological threat. Add the measured herbicide to the tank. Add 1 cup of water to the spray tank, place the top on the tank and shake to mix the water and herbicide. Water flow, contaminated diggers, soil movement, dumped vegetation, machinery, eel nets, livestock, boats and trailers all spread fragments into new catchments, pastures, cropping land, waste places and drains. Join now. The thrips and stem borer did manage to persist and establish populations which still exist today. Stems are green, pink or red, herbaceous, erect to trailing and hollow. Use penetrant in all herbicide mixes. Establish a regular routine of raking alligator weeds, such as every two weeks.

It is very adaptable and invasive. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Like the RHS on Facebook; Follow the RHS … Mix a 2 percent solution of glyphosate herbicide to kill alligator weed. Controlling alligator weed is accomplished using of both mechanical and chemical means. The beetle had the greatest effect in diminishing the weed population. Dark green, waxy leaves (3-13 x 1-4 cm) are opposite. A thrip and a stem borer were also imported and aided in the successful control campaign. Measure 1 1/2 ounces of glyphosate herbicide in a measuring cup. The plant is very invasive in this way. The best results come from treating the weed in the early stages of growth. Alligatorweed can form dense mats. It also clogs waterways and drainage systems. Add the water slowly to prevent foaming. This produces browning and signs of decay in 10 days. Spray the leaves of the alligator weed, but do not apply the herbicide to the point of run off to reduce the likelihood of contamination to the water in the area. Dig out small patches: either dispose of all pieces at a refuse transfer station, or dry them out and burn them - don't leave pieces of alligator weed on the top of soil or attempt to compost them as each piece can regrow. 2. Rapidly forms dense mats over water and margins, with roots down to 2 m deep. Perennial aquatic or terrestrial herb with long, fibrous roots. That means at least the outer surface of the wood showed signs of drying.

Alligatorweed (Alternanthera philoxeroides), also spelled alligator weed, hails from South America but has been widely spread to the warmer regions of the United States.The plant tends to grow in or near water but can also grow on dry land. Join the RHS today and get 12 months for the price of 9. He has implemented his own designs, as well as pulled from techniques learned through studies, creating many landscapes for others to enjoy.He has also maintained lawns, athletic fields, town parks, large gardens and game fields. Follow us. Use a herbicide specifically formulated for use in aquatic areas and consult a local extension office beforehand, since applying certain herbicides may contaminate water sources. Remove the top from the tank and fill the tank to the 1 gallon mark. Excluding stock from infested areas, lowering the light levels and nutrient runoff by planting along waterways can help in the ongoing management of alligator weed sites. Spray terrestrial sites (spring to autumn): glyphosate (20ml/L) or metsulfuron-methyl 600g/kg (5g/10L).

Place the top on the tank securely. Monitor the water area and remove as much of the plant on an ongoing basis as possible, especially during the active growth period from spring through fall. Monitor the weed for die back and reapply as needed to achieve control. Listed as a Federal Noxious Weed, it is highly invasive.

Also potentially spread by ethnic groups mistaking alligator weed for mukunu-wenna (Alternanthera sessilis), which they use as a vegetable.

There are a few biological controls that seem to have some effectiveness in controlling the weed. Rotting vegetation degrades habitats for aquatic fauna and flora. Alligatorweed (Alternanthera philoxeroides), also spelled alligator weed, hails from South America but has been widely spread to the warmer regions of the United States. List of various diseases cured by Alligator Weed. Other common names alligator weed Family Amaranthaceae Name Status RHS Accepted name Get involved. How to Get Rid of Wild Strawberries in Grass, How to Mix Spectracide Triple Strike Concentrate, Texas Invasives: Texas Invasives Database Alligatorweed, California Invasive Plant Council: California Invasive Plant Inventory Database, Information Center for the Environment: Invasive Species List and Scorecards for California, How to Clear Weeds From a Large Pond With a Rack, How to Get Rid of Black Flies From My Dwarf Lemon Tree. Getting rid of alligatorweed is the responsibility of any riparian or waterway manager. Put on rubber work boots or hip waders for wading into shallow areas to manually remove alligator weed. Hydrilla Management: Tips On Controlling Hydrilla Weeds, Is Glyphosate Dangerous? 4. How Alligator Weed is effective for various diseases is listed in repertory format. Stem sections break and root readily.
By: Bonnie L. Grant, Certified Urban Agriculturist.

The first step is correct alligatorweed identification.

Mukunu-wenna (Alternanthera sessilis), nahui (Alternanthera denticulate), Ludwigia species, and willow weed all look similar. © Copyright 2020 Hearst Communications, Inc. Use extreme caution if you decide to use a herbicide for growth control of alligator weed. The average mixture is 1 gallon to every 50 gallons of water. Bone up on your alligatorweed facts and learn how to kill alligatorweed. Getting rid of alligatorweed is the responsibility of any riparian or waterway manager. Tolerant of 30% sea water, high temperatures, high pollutant levels, grazing, and other damage, but intolerant of frost. Foliage is opposite, simple and smooth. 1. Names of Alligator Weed in various languages of the world are also given. The best time to treat for alligatorweed is when water temperatures are 60 degrees Fahrenheit (15 C.).

Mechanical control of alligatorweed is not useful. Alligatorweed displaces native vegetation and makes fishing difficult.

Alternanthera philoxeroides, commonly referred to as alligator weed, is a native species to the temperate regions of South America, which includes Argentina, Brazil, Paraguay and Uruguay. Remove the top from a 1 gallon spray tank. An important tidbit of alligatorweed facts regards its ability to establish from broken bits of stem. Argentina alone hosts around 27 species that fall within the range of the genus Alternanthera. Alligator weed (Alternanthera philoxeroides) is found in U.S. Department of Agriculture plant hardiness zones 5 to 10. The Royal Horticultural Society is the UK’s leading gardening charity. Adjust the nozzle on the spray wand to a narrow spray pattern to allow for good coverage without an over concentration of the herbicide.

Once the plant is dead, it is safe to pull it or just leave it to compost into the area. Alligator weed forms a thick mat that can clog waterways, crowd out desirable vegetation, lower oxygen levels in water and increase the occurrence of sediment.
A small white flower is produced on a spike and resembles clover blooms with a papery appearance. Reach out into the water with a rake and pull alligator weed mats back toward you.


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