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This information is taken from the Bailey Nurseries catalog
Apple Rootstocks
Standard–Standard rootstock will produce full-sized trees. In
rich soil standard trees may grow to a height of 20–25' at full
maturity. Standard trees will generally begin bearing 5–8 years
after planting. Hardy to zone 3.
Malling 7A–A semi-dwarfing rootstock which will produce trees
that are approximately 60% the size of standard apple trees. This will
generally result in trees that are approximately 12–15' tall and
14' wide at maturity. This rootstock will cause trees to produce fruit
at an earlier age— usually 4–5 years after planting.
Malling 7A rootstock is reliably hardy in zones 4–6 and may be
used in zone 3 if subject to reliable snow cover (2–4") during
the coldest winter periods.
Malling 26–This dwarfing rootstock will produce trees that are
approximately 45% the size of standard apple trees. This will result in
trees that are approximately 9–12' tall and 10' wide at maturity.
This rootstock will cause trees to produce fruit at an even earlier
age—often 3–4 years after planting. The trees are generally
freestanding but in the early years of bearing some temporary staking
may be required to avoid leaning. Malling 26 is one of the hardiest and
most productive dwarf rootstocks (hardier than M7A). It is completely
hardy in zones 4–6 and may be used as far north as zone 3 if
subject to reliable snow cover during the coldest winter periods.
Dwarfing rootstocks will only reduce the size of the tree, not the size
of the fruit. Dwarf trees are easier to prune, spray and harvest.
Bud unions on dwarf trees should be planted at least 2" above ground
level to avoid scion-rooting and the loss of dwarfing characteristics.
Our understocks are budded 6" above ground. This allows for the tree to
be planted 6" deeper for better anchoring and better winter hardiness.
Standard sizing: Apples and crabapples
7/16 inch, trees are 3 feet or taller
(Note: The DCGP experience is that the trees are much taller than 3 feet - perhaps 5–7 feet tall.
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