This depends on a lot of factors including the following; do you want instant screening or are you willing to wait for several years? Plant type also will determine this as well. For instance, twelve Green Giants could be planted 8 feet apart in a zig-zag pattern and will form a nice barrier in about 3 years if you have room for them to spread. If you don’t have room for spread, you may be forced to consider broadleaf evergreens like Emily Bruner Holly, Chindo Viburnum or Ligustrum. These will not spread as wide so you’ll need more. A good spacing for the broadleaf evergreens is about 6 feet between each plant so you’d need about 16 plants.
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