Arum lily

in Plants
Hi iv recently put a arum lily in my pond and just wondering if it will survive?
Its in a aquatic basket and the top half of the plant is out the water
Also when winter comes am I best to lift it out the pond and put it in the shed till spring?
Any help will be greatly appreciated.
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They're pretty tough and will usually survive a UK winter if the crown of the plant is about 6" below the surface of the water - can you lower yours?
I'm in the northwest, bodes anyone know if arum llilies help clear the water, I once read this on google or is it just a myth?