Why have some of the leaves on my water lilies, in a pond, turned yellow when others have stayed green?

Because the yellow ones are dying.

Why have some of the leaves on my water lilies, in a pond, turned yellow when others have stayed green?
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Reply:Souds like the sun has got to them,i dont know much about pond lillies but thats my guess.
Reply:`cos thats what happens to them. Pull out and discard the dead leaves.
Reply:If you are talking about the same plant with yellow leaves while remaining leaves are green, then this is a simple fact to know about plants and their habitat. If the plant has new leaves and the older ones are turning yellow, then this is normal in a plants evolution. Always check new growth for the health of plants to determine that their roots are properly developing and doing their job. If it has not been repotted in a couple of years- then do so and recover the soil with rocks and gently place back in the water.
Reply:maybe,is the fact that the leaves that are yellow are not getting enough sunlight.
Reply:There is a multitude of things that could cause it: herbicide runoff, plant virii, there could even be some microscopic organism in the water that is eating some of the cells. Bugs could be eating it.





It could even be too much sun: UV can damage plant tissues too. And, as other answerers have suggested, it could just be part of the normal cycle of the plant, but without knowing the exact species, it's hard to determine that.
Reply:They have to die off sometime!