Vaccinium corymbosum

This is Blueberry Spartan, one of 4 I grow for cross pollination. It's a two year old and has had all flowers removed to promote growth, which was especially needed this year as I over pruned them and two including this one look a little sorry for themselves. Is this leaf colour normal GTers or does it point to nutrient deficiency?

I killed one of mine accidently and need to get another however I have never pruned them... I'll give it ago

Easily done apparently! Although they say no proper pruning until they 3-4 years old, just remove wispy growth and dead low hanging branches. Remove the flowers for the first two years to encourage the cane and leaf growth. But I'll be doing for three due to my over zealous secateurs!