Answer
What are the best evergreen plants for structure?
Box and yew for clipped structure, plus pittosporum, choisya and viburnum.
In short
Evergreens carry a garden through winter: box and yew for clipped structure, plus pittosporum, choisya, viburnum and evergreen grasses that hold their form. A backbone of evergreen structure is what stops a garden looking bare in the cold months.
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