Posted: 18/08/2014 at 22:06
Many ponds have the grass right to the edge Lyn so that it covers liner edging. You won't get too much soil going in - maybe a little initially. The only problems with grass is keeping the clippings out the water when you mow, and the edges get very wet because they act like a sponge - squelchy if you get lots of wet weather! It can be an advantage because you can plant into those edges and you don't need to worry too much about watering - the roots will work their way into the soil behind the liner and some things will be quite happy in that couple of inches. We had problems with a pond liner because it had been installed half way up the bank the pond had been dug into, and heathers planted on top. They were quite happy because the excess water ran down the liner and they just formed a huge mass of roots on top, but it wasn't funny when we had to remove and renovate some of the dead and overgrown heathers, clear brambles and willowherb, and put new planting in.
Fishy - if you use a liner, a small one isn't too expensive, and you can use all sorts of stuff for the underlay - I've even used underlay! Old blankets, or something similar, are great because it's just to prevent the liner itself from getting punctured by any bits and pieces below. It's less of an issue in small ponds since you won't need to go into them to clear debris or move planting baskets etc.