unknown plant which has changed colour

unknown plant which has changed colour

Observation - unknown plant which has changed colour. Description: This plant first appeared in my garden last year and I have no idea what it is. I am now worried that i have upset it by moving it from the shady spot in my garden to a patch that has slighty more sun because it has suddenly started to change colour from

This plant first appeared in my garden last year and I have no idea what it is. I am now worried that i have upset it by moving it from the shady spot in my garden to a patch that has slighty more sun because it has suddenly started to change colour from light green to a purple tint. What is this plant and is this a normal? I am keen to keep it as it is really pretty when it pops up and starts to unfurl itself in spring.