Pond edging

AdRock

Hello,

I’ve recently built a pond with liner and put stones around the edges but as you can see there is still liner visible around the back side of the pond.

Does anyone have any tips or ideas on how to cover the liner with something more natural looking please?

Fairygirl

Your level is out, which is why you have a gap. If you push some turf or similar under the liner at the other side/sides, that should help.
If you can't do that, plants which will hang over is the best alternative. Evergreens would be more successful. Grasses are good - Carexes in particular. Calthas [Marsh Marigold] are also good as they're marginal/bog plants, so if you can create a space for them with moisture retentive soil there, they'd fill the gap quite well.
 
It really depends what room you have though. Doesn't look like there's much unfortunately. You could try marginal plants if you have a shallow enough area there, or a shelf for putting them on in baskets. 

Dovefromabove

You could grow something like Creeping Jenny there ... pop small plants between the flat stones and by summer they’ll be spreading nicely so that they trail over the edge into the water, covering the liner. It’s a really good plant for around ponds, providing cover for froglets and little newts where they can hide safely from blackbirds as they leave the pond. 

https://www.crocus.co.uk/plants/_/lysimachia-nummularia-aurea/classid.1470/