Hide the Pond Liner: Pro Techniques for Invisible Edges

The Secret to Natural-Looking Pond Edges

In the Better Homes and Gardens Test Garden®, we built two ponds: a typical kidney-shape with plastic liner and flagstone edging, and an atypical L-shaped limestone block box. They look completely different — one formal, one informal; one ground-level, one seat-level — but share a crucial feature: the liner hides itself at the edge, eliminating the ugly exposed liner that ruins most garden ponds.

The Common Flaw in Pond Instructions

Most books/magazines say: dig hole, spread liner extending 1+ feet out, place flagstone ring over overlap. Problem: you hide the outer lap but dramatically expose the liner inside the pond. Water must stop 1-2" below ground level to prevent overflow bogs. This leaves 1-2" of black liner visible around the entire pond — streaked with mineral deposits from evaporation. Summer heat drops water further, exposing even more liner.

Add your own small, inexpensive water garden with our how-to.

How to Hide Pond Liners (Test Garden Method)

The trick: Make edging two layers deep, not one. Wrap liner around the bottom layer. Now fill within 1-2" of the top layer — liner goes underwater and stays underwater, invisible from both garden and water sides.

Works with flagstones, bricks, pavers, timbers.

Formal Stone Pond Construction

We used precut limestone blocks, cutting one per course with gas-powered diamond saw.

Liner placed, folded/pleated for corners, surplus brought over edge. For the course below the top, we used half-width blocks. Liner folds over edge, rises between two blocks — invisible from garden side and water side.

Many liner folds meant we cut excess level with block tops, then laid top course. Top blocks overhang bottom ~1" — elegant touch.

In-Ground Pond Application

Dig pond, spade shelf around edge (depth/width of edgers). Run liner over shelf, lay bottom edgers (flagstones) on liner, fold liner on top, lay final edger circle on bottom layer to secure. Liner invisible from both sides.

Bottom line: When you build a pond with plastic liner, forget the books — fold the liner out of sight and fill it up.