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11/02/2014 at 13:53
Ok, this may sound a bit long winded so please bare with me. The pond/lake (37x55m approx) had been neglected for many years and as a result had a large build up of leaf litter and sediment. After a discussion with a specialist it was decided to treat the lake with hydrated lime over 12 weeks last spring. This cleared the water no end and the sediment breaking down was there for all to see with no ill effects on water quality or the fish. However there was obviously massive amount of nutrients now being released into the water. After a small algal bloom and an increase in aquatic invertebrates the weeds which had been laid dormant in the previously low oxygen, nutrient poor water began to emerge. Some reeds and grasses were no problem to manage, weeding by hand but there is one plant which seems to be slowly trying to take over and I am struggling to contain it. Where the water is shallow enough to wade I pulled it out by hand hoping that the growth would slow ready for a fresh assault on it in the spring, however it has kept growing over winter. My worry is that the lilies which have been potted in the lake ready for this year will be out competed and I will end up with nothing but a mass of weeds. I have struggled to identify it and any help in the management would be greatly appreciated. Hopefully the pictures below have worked.
11/02/2014 at 13:56
11/02/2014 at 13:57
11/02/2014 at 14:00

Sorry - no pix stansty 

Is it the oxygenator  Elodea crispa by any chance? It's gets pretty rampant very quickly. At my last house we removed  huge clumps of it because such a huge amount was unnecessary as the pond was spring fed, not standing water. 

11/02/2014 at 14:06

I can get the pics but I don't recognise it, sorry.


11/02/2014 at 14:29

No pic sorry. Can you try and post it nutcutlet, maybe that will work.

11/02/2014 at 14:32
11/02/2014 at 14:36

It looks like Glyceria maxima. Look that up and see if it matches what you've got.

11/02/2014 at 14:44

Thanks. Nut, that works fine.

11/02/2014 at 14:49

I didn't see it as a grass or any sort of monocot. 

Seeing it in situ might be helpful, is it in deep water, a marginal or what.Does it float or rooted to the bottom, in deep or shallow water. Does it emerge from the water or entirely submerged? Did it flower last summer? What are the roots like? Are they all linked together like a spreading perennial or lots of individual plants. 

11/02/2014 at 14:54
11/02/2014 at 16:36

Does that grow here?

Probably classed as an invasive alien weed if it does


11/02/2014 at 18:13

Yes it does and has done for many years. I grew up on the river wear (hunwick)and had a council dump at the bottom of the hill, at a place called Newfield they dug big 10 by 50 meter  pits all in a row like army barracks.  2 columns deep. the water was clear and full of Gold fish. Great crested newts and toads. (  might have been there a bit before i was born)

You can imagine where the gold fish came from.

Please take a look and see ( if you can find), as i have moved and would love to know. The ponds where right next to the wear, between newfield and sunnybrow. I bet that place has changed. Try the aerial view from sunnybrow Co. durham, down hill. It was all fenced off but that will never stop us kids!

11/02/2014 at 18:16

Is it very invasive?

A fence is an invitation to a kid

11/02/2014 at 18:28

I don't think Water Stargrass would grow outside in the UK, but it could be a Water Starwort (Callitriche species).

11/02/2014 at 21:42

I did look at that landgirl100. ( Starwort ) what makes you think it is that? 

Apart from what you said Above? There are far too many non native species in this country unfortunately.

Where do we start.?????

11/02/2014 at 23:22

Callitriche is common in fresh water in the UK, and from my botany books the appearance is similar for a couple of species. I'm not totally convinced, however. 

Stansty, why not post your photos on iSpot? They are great at ID over there.

Edd, you are right, there are lots of alien plants (love that expression, makes me think of plants in spacesuits!)

11/02/2014 at 23:53

I am looking at Callitriche now and have found that they have paired leaves either side and not staggered like the photo. Starwort has elliptical leaves (below)when young and not the long leaves like this. You now have distracted me and i am looking into space for stars, but that is a very,very nice thing, thankyou. we all need a brake sometimes. Perhaps some snow tonight.


12/02/2014 at 07:53

A bit more info from stansty might help

12/02/2014 at 08:39
Hello, sorry for the late reply and thanks for all of yours. To answer some of your questions:
The weed is currently growing in water from 18 inches to 4 foot. Its currently completely submerged and seems to be staying that way. Its growing with interconnecting roots which break off easily as individual plants. The water movement in the lake since Autumn has been low as the fountain is out for maintenance over winter. I'll try to get an in situ picture for you now. And apologies in advance as I'm doing all this on my phone! Thanks again.
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