I recently ( early May ) planted a hedge of Thuja Emerald Green Smargard and on close inspection this week it appears that they are all dead. They look green on the outside but seem to have been infested with spider mites? ( there is webbing present ) and are dead on the inside. Their location was part shade, decent soil, and along a cedar fence. I didn't think spider mites were that much of a pest. Before I go ahead and replant this hedge, I wonder what the most likely cause of death would be: air flow, the mites, or the part shade? I'd like to replant along this same fence and am looking for suggestions if this turns out to be the wrong plant for this place. Thanks!