That is a Bill C. question and hopefully he will see it. FWIW I have read that new pond plants need to acclimate to a pond if the water is significantly different from the water they came from. It is not unusual for all existing growth to die off. New growth will come from the rhizomes/roots (if they are still there.) I have no idea if this is what is happening with you. Again, hopefully Bill C. or somebody else with first hand experience will chime in. FWIW I planted my lilies 10 days ago or so and they are surviving but not thriving.

Good Luck.

Bill D.

Last edited by Bill D.; 05/20/15 08:42 PM. Reason: Clarification
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