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One we built a few yrs ago, see how the plants naturalise the rocky apperance. Rocks disguise the liner which would otherwise be bordered by grass and soil and lead to murky water and also grass cuttings getting into water with each mow.  - Landscaping and Water Features -  Creative Cascades One we built a few yrs ago, see how the plants naturalise the rocky apperance. Rocks disguise the liner which would otherwise be bordered by grass and soil and lead to murky water and also grass cuttings getting into water with each mow.