Answer: The trees recommended by utility companies are rather small at maturity so their branches will not interfere with telephone and power lines. Their list of suggestions for evergreens includes Juniperus virginiana 'Burkii' (20' high), 'Canaertii' (30'), 'Glauca' (20'), and 'Hillii' (20'). Picea glauca 'densata' (Black Hills Spruce) has a narrow, dense habit and grows to 20'. Thuja occidentalis 'Techny' has a slow growth rate to 20'.
Hope these suggestions help you choose just the right tree.
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