Duckweed in a Pond

Duckweed has featured at the Chelsea Flower Show in the past, but this doesn't mean it's desirable to everyone, nor does it mean it's easy to look after. 

When duckweed starts to thrive it will literally cover the entire surface of your pond if left untamed. Eventually your pond could look like the image, which almost looks like a surface you could walk on. (Once when walking the dog, she thought it was a solid surface, and did she get a suprise!)

Some fish will eat duckweed, but not at a fast enough rate to hold it back.

Duckweed is not necessarily dangerous to your pond, it will make your fish and wildlife difficult to observe. Dead and brown duckweed though, should be removed from the pond as soon as possible, as it can sink to the bottom of the pond and pollute  the water.

The ideal solution to get rid of duckweed is to use a pond skimmer, a pond skimmer works by "skimming" the surface of your pond and removing any excess waste, this includes duckweed.

There are difficult types of skimmer available, you can buy stand-alone skimmers, which have their own pump built in and will float around the pond. You can also buy a skimmer which will fit onto your pump, sending the debris to your filter, but please note, your pump must have a sucking option for this to work.

To begin with, we'd advise to remove as much of the duckweed as possible yourself by hand, then to add the skimmer, this will prevent the skimmer from clogging up too fast and means it will work more efficiently, hopefully preventing it from growing back.