Descampsia 'Morning Light'

I bought this plant last year and planted it.  It survived the winter just fine but seems to be ALL DARK GREEN this year!  AAAAh!!  If any of you have seen this you know how beautiful it is with pale green, pink and white stripes. 

It is on the north side of the house -- does it need more sun to bring out the color or is something nefarious going on?  Any help is appreciated.

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