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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.
I can get the pics but I don't recognise it, sorry.
No pic sorry. Can you try and post it nutcutlet, maybe that will work.
It looks like Glyceria maxima. Look that up and see if it matches what you've got.
Thanks. Nut, that works fine.
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.
Does that grow here?
Probably classed as an invasive alien weed if it does
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!
Is it very invasive?
A fence is an invitation to a kid
I don't think Water Stargrass would grow outside in the UK, but it could be a Water Starwort (Callitriche species).
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.?????
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. www.ispotnature.org
Edd, you are right, there are lots of alien plants (love that expression, makes me think of plants in spacesuits!)
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.
A bit more info from stansty might help