A couple years ago my husband planted three yew shrubs in our yard. The two on the outside are doing great, beautiful color and are growing well. The one in the middle is a much lighter color, was the only one to have berries this year, and while the same size it just does not look as healthy as the others. Any chance it’s a different shrub? Or what reason is there for such a difference? The picture doesn’t do it justice, it’s almost yellow in spots.