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 during the last month of the year. David Coton suggests some garden jobs that can occupy the short 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

Planned TV Gardening Programmes 2019

Planned TV Gardening Programmes 2019

There's no doubt that television provides gardeners with inspiration, tips and good ideas, that's why we're all looking forward to new programmes and the return of old favourites during 2019.

Author: David Coton

Written by David Coton.
Published on Tuesday, 13th of February, 2018.

GardenSite Listed In The Top 1000 Internet Retail Sites

GardenSite Listed In The Top 1000 Internet Retail Sites

The InternetRetailing Growth 2000 Report was published last week and the great news for GardenSite and our customers is that we are now listed as one of the UK's top 1000 retail websites.

Author: David Coton

Written by David Coton.
Published on Wednesday, 13th of February, 2019.

What To Do In The Garden In February

What To Do In The Garden In February

Although snow has arrived at the garden centre, we will be receiving new stock during February in readiness for spring which hopefully is just around the corner, and David Coton suggests the jobs you should be tackling in the garden this month.

Author: David Coton

Written by David Coton.
Published on Monday, 29th of January, 2018.

Which Log Store Should I Buy and Why?

Which Log Store Should I Buy and Why?

Wood burners and open fires that require a good supply of dry, well seasoned wood, have enjoyed a resurgence in popularity over the past few years. Log stores have therefore become increasingly essential and David Coton explains the differences between the many that are now available.

Author: David Coton

Written by David Coton.
Published on Friday, 12th of October, 2018.