Answer: Juniperus scopulorum grows at the rate of 6-12 inches a year. Thuja occidentalis 'Pyramidalis' has a medium rate of growth (same as your 'Skyrocket'). Arborvitae (Thuja) can withstand light shading, while the juniper prefers full sun. Thuja has a tall, upright growth habit, remaining 2-3' in diameter but reaching 15-20' in height. Best wishes with your landscape!
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