Guide to Pond Duckweed

My guide will help you to understand duckweed in your pond, explaining what it is, how it can affect the pond, and how you can control it.

Created by David Coton on Monday, 7th of July, 2014.
Updated on Tuesday, 20th of December, 2016.


Duckweed in a garden pond

The common name is Duckweed and it's botanical name is Lemna minuta. It can be a real nuisance, especially if you're trying to keep your pond clear. Many people report that once they've rid their pond of green water and blanket weed the next problem that arises is Duckweed.

The reason for this is because it feeds off the nutrients in the pond, just like green water and blanket weed do too, so once the others are out of the way duckweed is free to feed all it likes, multiplying and covering the pond.

During the Summer duckweed can quickly multiply, especially in slow moving or still water. It has been known to double in quantity at times in one day.

What Does Duckweed Look Like?

It looks like hundreds of tiny leaves around 50mm in size, a bit like water cress they won't get any bigger than this size. They will usually appear in the Spring and sinking to the bottom of the pond in the Winter and surviving, returning next year. It stays green through the Winter so it's easy for you to spot and remove from the pond.

Where Duckweed Comes From

Duckweed can be introduced into your pond by accident on plants you've been given or bought or through animals like birds, this is sometimes unavoidable so be prepared to one day face the problem of duckweed if you have a pond but have not yet experienced it.

The easiest way to stop duckweed from entering the pond on new plants is to isolate them from the pond for a couple of weeks before introducing them, this can also stop blanket weed problems too.

Can it Be Treated?

The best way to manage duckweed is through regular raking and collecting with a pond net to reduce the amount in the pond, you can even use it in your compost too, the nutrients will really help.

The other option is to use a pond duckweed treatment but this can take a few weeks to work, so if you're clearing the pond for a garden party then it's probably best to go with the first option of manual removal.

As it is natural duckweed can easily return through one of methods mentioned above so always be alert.

Further Information

Read my guide to Pond Blanketweed.

 

Related Articles

How Can I Prevent A Pond From Freezing?

How Can I Prevent A Pond From Freezing?

An iced over pond will have a detrimental effect on animal and plant pond life, although fish and amphibians will survive under a frozen surface for some time, ice traps gases escaping from decaying material and prevents oxygen from entering the water.

Author: Dan Everton

Written by Dan Everton.
Published on Wednesday, 22nd of August, 2018.

What To Do In The Garden In May

What To Do In The Garden In May

Although the weather is feeling decidedly chilly for the time of the year, during May the threat of frost will pass and, with spring well under way, David Coton is in no doubt that this is going to be a busy month in the garden.

Author: David Coton

Written by David Coton.
Published on Monday, 30th of April, 2018.

What To Do In The Garden In April

What To Do In The Garden In April

With warmer weather and an early Easter, the garden centre is busy at the moment with customers stocking up on summer bedding plants - snapdragons, cornflowers, cosmos, verbena, phlox, petunia, As well as filling planters, hanging baskets and borders with colour that will last all summer, there are always plenty of jobs to do in the garden during April and David Coton has these suggestions.

Author: David Coton

Written by David Coton.
Published on Thursday, 29th of March, 2018.

What To Do In The Garden In December

What To Do In The Garden In December

Whether it's a bleak December or the more mild weather we are becoming used to, you can still spend useful time in the garden. David Coton suggests the jobs that can occupy the shortening days.

Author: David Coton

Written by David Coton.
Published on Monday, 20th of November, 2017.

comments powered by Disqus

Author

David Coton

Partner at GardenSite

View Profile

RSS

View RSS Feed

Follow Us!

Recent Articles

How Easy Is It To Keep Chickens?

How Easy Is It To Keep Chickens?

Chickens aren't difficult to look after, all they require is a constant supply of water and regular food. As Martyn Loach explains, you should keep an eye open for any ailments, and they'll need to be cleaned out once a week.

Author: Martyn Loach

Written by Martyn Loach.
Published on Monday, 15th of October, 2018.

How Do I Construct And Maintain Timber Garden Decking?

How Do I Construct And Maintain Timber Garden Decking?

Timber garden decking never seems to lose its popularity, and why should it, when it's such a useful way of extending your living and entertaining space. Andy Taylor explains why decking is so easy to install and how best to look after it.

Author: Andrew Taylor

Written by Andrew Taylor.
Published on Thursday, 11th of October, 2018.

What Do I Need For A Great Halloween Garden Party?

What Do I Need For A Great Halloween Garden Party?

You can create the spookiest Halloween Party in town with a spine chilling cast of para-normal misfits including ghosts, ghouls, zombies, vampires and many other sinister characters who inhabit the dark side. David Coton tells you how to transform your home and garden into a thoroughly scary experience.

Author: David Coton

Written by David Coton.
Published on Wednesday, 10th of October, 2018.

What To Do In The Garden In October

What To Do In The Garden In October

In October, David Coton is getting the garden prepared for the onset of colder weather but, at the same time, the arrival of spring bulbs in the garden centre is a reminder that you should also now be planning ahead for next year.

Author: David Coton

Written by David Coton.
Published on Monday, 2nd of October, 2017.