Why have my Hosta's leaves changed?

Jan13995171
by Jan13995171
My Hosta plants that have been divided years ago from plants my mother gave me from plants that were given to her from her mother. They have always been the variegated leaf( green with white) In the past ten years or less more and more of them have been turning to all green leaves when they come up the following spring and when they do this they have also grown triple in size. Why is this???I have asked numerous nurseries and they don't know why. Could it be acid rain?
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