The Arbor Day organization say 10 feet apart for dwarf appletrees. I have heard of trees in intensive plantings as close as 4 to 5 feet apart. You should also take into account your soil type, in a heavy soil roots will stay closer to the surface so you should give them more space, in sandy soil the the roots will go deeper an compete less. If you want the trees closer together consider planting on a berm or hugel bed, planting trees above the soil level will encourage the roots to go down.
Ken W Wilson
Location: Nevada, Mo 64772
posted 1 year ago
You might try researching the rootstock and make sure it is disease resistant and suitable for your site. A lot of the dwarf rootstocks aren't very hardy.
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