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It depends on the size of the tree. Old fashioned apple trees grown on seedling could be as few as 40 trees per acre for varieties like Greenings that had a tendency to spread wide. Modern, trellised or post-supported full-dwarf apples can have 600 to 800 trees per acre. There are experimental plantings that go to even higher density. The trend is to smaller trees at higher density. They are more efficient for pollination and spraying, and they are safer to pick - without picking crews on high ladders. Pollinator 03:17, 19 February 2006 (UTC)