How to Get Rid of Blanket Weed?

Kudos if you have not yet encountered this annoyance! Blanket weed, sometimes known as long string algae, is among the most well-known (and despised) pond weeds in the United Kingdom.

It’s a long, thin algae with no leaves, stalks, or roots that creates enormous, dense cushions of greenish weed that float about the top of your lake and stick to the side walls.

Blanket weed flourishes in ornamental lakes with pumps because of the sunlight, rushing water, and ample nutrients. Here we will discuss, how to get rid of Blanket Weed using the best weed and grass killer.

What is Blanket Weed?

What is Blanket Weed

Under the cover of carpetweed, or thread algae as it is often known, there are approximately 20,000 distinct algal forms with over 550 species.

Blanket weeds is a hair-like algae with long green fibers that grow and swiftly spread over a pond if left unchecked. This type of algae could either float freely on the top of the lake or adhere to the lake’s walls, rocks, and plants. Blanket weed, like other algae, reproduces by spores. These cells can be found in the air and can be transported from pond to pond by birds, animals, and plants.

Is Blanketweed Dangerous?

Is Blanket Weed Dangerous

In a nutshell, yes, it can be harmful to the pond and its ecosystem.

Blanket weed, like all other aquatic plants, requires the same nutrients to thrive. As a result, it grows swiftly and easily outperforms and outgrows your other marginal or watery plants. Furthermore, because it prevents natural light from entering the pond, it destroys any submerged vegetation.

Blanket weed will fight with fish for crucial oxygen, potentially resulting in your fish dying from a lack of oxygen. Moreover, fish can get caught in blanketweed and perish as a result of not being able to extricate themselves.

How to get rid of blanket weed?

It is not recommended to remove existing blanket weed since doing so will allow the plant to release seeds into the pond, causing additional blanket weed to grow. As a result, we recommend treating your lake with Pond Equaliser first, and then utilizing Blanketweed Klear to ensure that your pond’s water quality is excellent. Simply sprinkle it over the blanket weed, let it to die, and then scoop up the dead plant. Put it in your yard trash bin or compost bin to get rid of it. Blanket weed has a lot of nitrogen, which is great for composting.

Preventing Blanketweed

Preventing Blanket Weed

If you employed a treatment to eradicate blanket weed from your lake, you must restore the proper balance in your pond. If you do not do this, you may be certain that the problem will reappear.

Keep the number of fish in your lake to a minimum since waste from pond life can raise the nutrient level in the water, allowing algae to grow.

Get rid of any decaying plants, including dead leaves. While they appear to be minor difficulties, they have the potential to rebalance the water levels, hence increasing nutrient levels.

Clean pond filters on a regular basis to eliminate uneaten fish food, fish faeces, and other detritus that contribute to high nutrient levels.

Ensure that all of the plants in your pond are alive and well.


After eradication, you’ll want to do everything you can to keep it from reappearing in the future. Make sure there are enough aquatic plants in the lake to absorb extra fertilizers. Maintain a fish stock that is proportional to the size of your lake. Finally, too many fish can result in excess waste, which can lead to even more surplus nutrients. Check the quality of the water using a test kit on a regular basis to ensure that your pH, KH, and GH levels are balanced.

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