make a flower box within the liner sorta speak and fill with the clay
More then just a mess if you just place bentonite on the bottom and pull plants out latter you will create leak a weeper where the water will leach out unless your soils are also high in clay contentWhy clay? Pond plants grown great in gravel - far less mess to deal with. You will be pulling plants up to divide them eventually - pulling them out of gravel just dislodges gravel. Pull them out of clay and you'll have a mess.
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