London (change)
Today 22°C / 16°C
Tomorrow 27°C / 16°C
7 messages
14/04/2013 at 16:13

We started our small pond last spring and it was as clear as a bell all summer and then all of a sudden about late December the dreaded blanket seed started appearing, now the poor pond is virtually covered! What is the best way to get rid of it? I don't really want to use chemicals because we have 8 goldfish in it. Does barley straw work as well as i've read? and would it be best to completely empty the pond, get rid of the weed and start again, introducing the straw? I have a one lilly and some marginal plants and the pond is serviced with an ultraviolet  filter, pump and fountain

Any suggestions gratefully received!

14/04/2013 at 17:07

Blanket weed is the very devil to get rid of!  You can never eradicate it, in my experience, but the best thing is to try to keep on top of it.

First - use a stick to twirl it around (like trying to get candyfloss on a stick!) and dispose of the weed.  Then ensure that the pond is as clear of it as possible - and for this, yes, barleystraw bales are pretty good.  Also use watercress!  If you can get hold of proper watercress bundles (remember the bunches sold on market stalls?) chuck them in, and leave for a couple of weeks.  Dunno why or how it works - but it does!  Keeps the dreaded blanketweed at bay, and can easily be removed.  But even this is not a cure-all you still need to be vigilant, and the stick twirling may still be necessary.

14/04/2013 at 17:36

Hallo Sloeberrysal

We had the same problem and bought the following from Thompson & Morgan:

It's not cheap, but worked extremely well. Try and remove as much of the weed by hand as suggested above first. You might have to do it twice a year, but can thoroughly recommend.

There's nothing worse than a green pond!

14/04/2013 at 17:38

Oh, forgot to mention, when you open link click on the GB part top right (page I gave you is for overseas!) Search Pond-Wizard!

14/04/2013 at 18:30
And try to grow water lilies and other plants to cover at least 40% of pond surface. Prob wrong on that % but it's what I always aim for. Sunlight helps algae and blanket weed to grow. Oxygenating plants too are important so make sure ??ou have plenty of those.
Fish too create conditions for algae to may sound cruel but I cut out fish food and the fish then ate the algae.
Prb wildlife folk will think me mean......but, have you seen the cost of fish food lately?
14/04/2013 at 20:20

Verdun we bought a big bag of koi food a week before someone nicked all the fish...

The watercress absorbs the nutrients which the algae feeds on and starves it. It's amazing how well it can work. Verdun's right about the oxygenators -they're a must -but they can be invasive too so keep an eye on them especially as it's a small pond. As with most things, maintenance is the key.

14/04/2013 at 20:50

Watercress in bags from the supermarket always has a few roots or can be persuaded to grow some. That's where mine came from. It's going very well at the moment. The algae in the pond without the watercress is thicker.

email image
7 messages