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Aquatic Weed Management

aquatic-weed-managementAquatic weed is an important part of the ecosystem in rivers, waterways and lakes. They provide food and a safe habitat for animals as well as helping to reduce the erosion of riverbanks and absorb pollution. Some aquatic weed may have been deliberately introduced for ornamental reasons; some appear out of the blue, this maybe for a number of reasons.

Aquatic weed only become a real problem to most when they grow excessively and spoil the appearance and quality of the watercourse.

Canadian Pondweed dragged clear from a lake using our weed rake system

Invasive aquatic weeds cause the following problems:

  • Increased risk of flooding and water logging of land that can persist even when the weed has appeared to die back
  • Silting up of watercourse impeding flow and increasing the need for dredging
  • Invasive weeds interfere with boats, fishing and other forms of recreation
  • Weeds and algae can become detached and float downstream blocking pumps, sluices and filters
  • Some aquatic weeds can deoxygenate water killing fish and other aquatic animals as well as causing serious odour problems
  • Rapid growth of aquatic weeds suppresses other species of aquatic plants

Control of aquatic weeds doesn’t need detailed knowledge of every aquatic plant but applying the following principles:

Identifying the weed – see our section on the different weeds to help you identify what you have.

Habitat and lifecycle of the aquatic weed – where and how the weed grows

Cause of the weed problem – is it run-off from neighbours or your site

Timing of weed control – when is the best time of the year to take action

Our services

  • Aquatic weed raking system
  • Herbicide treatment

Aquatic weed rake services

Capable of removing literally tons of aquatic weed in hours, our revolutionary weed rake removes from the root which means the problematic weed truly is thinned and reduced. Unlike weed cutting, which over a short period simply makes the problem thicker and less manageable, the weed rake effectively removes the weed leaving clear lake and river beds but at the sometime helps by aerating the bed.

This service has been used all over the UK and by many companies and private home owners, but for the first time this year we was successfully able to measure the quantity removed in a six hour period, with just over 30 tonnes of Canadian pondweed being achieved.

Although this equipment is quite large the rig is much smaller and is able to be used in the smallest of locations, all of the equipment is able to be carried by hand which illuminates backside damages.

For more information on our Aquatic Weed Raking system click here.

Herbicide treatment services

Herbicide treatments are very successful but must be managed and controlled using the correct procedures. All of our staff working with herbicides are fully qualified to PA1 and PA6water certification.

We offer a full spraying service from both land and boat and also injection treatments for such weeds as Japanese knotweed.

For more information on our Herbicide services click here.

At Ponds UK – Aquatic Management Limited we offer a full “Hands-on” service and consultation package to help you deal with your weed and plant problems. We understand it can be a daunting task and with our support we plan to make it all a little easier to manage.

Common aquatic weeds – (Click the images for more information)

Duckweed / Lemna Species

Duckweed / Lemna Species – Click this image for more information

The Lemna species is able to multiply at a very rapid rate. The smallest amount could lead to a substantial sized pond becoming completely covered in a short period of time. It is possible to treat this weed with Herbicide but unless it is the only aquatic plant it will be hard to eradicate without damaging other aquatic plants.If your pond is small enough to manage, simple removal with a net will be more than adequate on a regular basis. It offers very good cover to aquatic life.

Canadian Pondweed

Canadian Pondweed – Click this image for more information

Canadian Pondweed, extremely common in inland waters and offers good cover for all forms of aquatic life. In some cases it is very welcome, natural wildlife ponds for example. In other cases it could devastate a lake or pond especially one used for recreational use such as fishing or diving.Our Weed Rake system is extremely effective at removing this weed and has managed to pull up to 8 tonnes in just one retrieve.


Parrots Feather – Click this image for more information

On occasions, given the correct circumstances, Parrots Feather can be an extremely attractive weed.If controlled it can help to establish some very good cover for aquatic life with a plus of a very attractive visual effect.Again as with most of the aquatic weeds on this page, it can spread very quickly and choke a water in a very short timeframe. It is not advised to introduce this weed into any waterway enclosed body.Our Weed Rake system is extremely effective at removing this weed.

Pennywort - Click this image for more information

Pennywort – Click this image for more information

Found in shallow, slower flowing bodies of water, Pennywort grows at a staggering rate of up to 20 cm per day in some cases and can regrow from a single node.Given the correct conditions it can choke a water within weeks and because of its nature it is not the easiest of weeds to remove.Herbicide treatment is limited due to the density and speed at which the growth can recover. Given this treatments will need to be kept regular.

Water Milfoil - Click this image for more information

Water Milfoil – Click this image for more information

Water Milfoil is a steady growing weed which can lead to choking of very slow or non-flowing waterways. Chemical control for this weed is not possible, which only leaves mechanical and dyeing of the waterbody.The reduction in UV will slow and can stop growth but will take a little time to have the desired effect.It is not advised that this weed is introduced to any water body.

Australian Swamp Stonecrop

Australian Swamp Stonecrop – Click this image for more information

Australian Swamp Stonecrop, a strong an fast growing weed which will choke a water given the correct conditions. It will outcompete any other aquatic plant life, choking and reducing oxygen levels due to its dense growth.Introduced in 1911 it was not found in UK waterways until 1956 but has slowly become more established and has been found in locations across the country.Treatments with Herbicide is possible but will be a constant procedure throughout the year to remain onto of the growth.

Curly Leaved Waterweed - Click this image for more information

Curly Leaved Waterweed – Click this image for more information

Overtaking the spread of Canadian Pondweed, Curly Leaved Waterweed has become widely spread across the UK in recent years.Once introduced to a waterbody it can soon become out of control and treatment is not always easy due to its rapid redevelopment.Water dye and mechanical treatments are the main methods for control and the Weed Rake system does this very well. Backed up with a dying program to reduce UV levels it is possible to reduce the levels of this weed to a minimum.

Water Fern - Click this image for more information

Water Fern – Click this image for more information

Introduced for ornamental ponds and now banned for sale in the UK since April 2014, Water Fern is a fast, aggressive multiplying weed which will soon grow out of control and choke lakes, rivers, canals and any other waterway.Mechanical removal is the only option for this weed and due to its floating nature it is extremely hard to completely eradicate once introduced.

Water Starworts

Water Starworts – Click this image for more information

Unlike some other aquatic plants, Water Starworts may not always have the same shaped leaves so identification of the strain maybe harder to conclude. Very much effected by water quality, pollution and other factors.On the plus side they do form good shelter for fish and other aquatic life as well as producing good breeding grounds for food sources.This species will normally only grow in depths of up to 1m so providing your waterbody has variable depth, most of the growth should be constrained to the marginal areas.


For more information on our other management services click to find out more below;

We supply all equipment and our services to anyone Domestic and Commercial throughout the United Kingdom. For more information and advice about any of our products or construction / maintenance / fishery and consultancy services, please email info@pondsuk-aquaticmanagement.com or call 0800 4725524