Do you mean the Nest Spruce? I am not personally familiar with this species, but online nursery descriptions seem to suggest that the needles are naturally tinted grey. Descriptions such as “blue-grey” and “dull grey” are used to describe the needle color.
I hope this helps some, sorry I couldn’t find anymore specific information. Generally speaking, when conifer needles die they turn more of a rusty brown color–whether this death is caused by pest or drought or other environmental conditions. The only thing that I have seen turn forest trees greyish is a forest fire, and the grey results from the charring.
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