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I moved into a new house a short while back that has a small pond in the garden. In the pond there is a Lillie plant what is now dying back.
Should I cut off all the leaves or should i let it die back inself?

Thanks,
Thomas

Welcome Thomasb :D

If it were mine I would cut the leaves back as they died, any rotting leaves in the water can upset the balance of the pond next year. And make the water manky ;)