Published spacing: 15 ft between trees. Source: University of Maine Cooperative Extension, Spacing Trees in an Orchard (figures are for regions with cold winters and short growing seasons).
Leave the number of rows at 1 for a single row such as a hedge. Every figure here is a starting point from the sources below the calculator: check your own species and site.
Trees = floor(Length ÷ In-row spacing) × floor(Width ÷ Row spacing)
Trees per acre = 43,560 sq ft ÷ (Spacing × Row spacing)
You can plant about
24 trees
6 per row, 4 rows
At this spacing
194
trees per acre
Trees are laid out inside 5,400 sq ft.
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