Answer: Buxus sempervirens or common boxwood will reach 15-20 feet with equal width. Cupressocyaris leylandii is an hybrid that very fast 15-20 feet in 5 years, eventually reaching 60 feet. Takes full sun and needs regular water. There are different Euonymus or Juniper varieties that might work for you. Check with a local nursery to see what they carry. Japanese Yew (Taxus cuspidata) can reach 15-20 feet.
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