Posted: 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.