Apple Tree Rootstocks

Most apple trees purchased for fruit production are made from two parts which are grafted together when the tree is very young. The root and approximately the first 25cm of trunk is called the rootstock and this is mainly responsible for the eventual size of the tree. The rest of the apple tree, called the scion, controls the type of apple which is produced. A number of rootstocks can be used, according to how large you want the tree to become. Some other factors also have an effect on the size of an apple tree, such as pruning, soil type and climatic factors but none are as important as the choice of rootstock. Dwarfing rootstocks are the most common ones used today as the old fashioned, standard trees, are less popular because they take up a lot of space and the fruit is higher up and therefore more difficult ot pick

This table gives a brief guide to the most popular rootstocks and their effect on a tree's final size

Rootstock

Approx height

Width

Stake needed

Comments

M27

1m to 2m

1m to 2m

Yes

Very dwarf, produces the smallest mini apple trees but growing conditions need to be very good. Fertile soil with no competition from weeds is required for a reasonable crop to be produced. Apples Trees on this rootstock will need a permanent stake if they are planted out in an exposed position. They make good trees to grow in pots on the patio. Fruits from a young age

M9

1.6m to 2.5m

1.6m to 2m

Yes

Dwarf, produces a small apple tree for garden cultivation as a bush or trained against a wall, but growing conditions need to be very good. Fertile soil with no competition from weeds is required for a reasonable crop to be produced. Apples Trees on this rootstock will need a permanent stake if they are planted out in an exposed position. They start cropping quicker than trees on more vigorous rootstocks. Can be grown in a large pot on the patio

M26

2.3m to 3m

1.8m to 2.5m

Yes

Semi-dwarf, produces a good size tree for a small to medium size garden. Vigorous enough to succeed in a less fertile soil and some competition from weeds. Recommended as a good choice for a bush tree, also as an espalier or cordon tree. Produces a good crop of apples from the third year onwards. Staking will probably needed in most gardens. Regular pruning can keep this tree to about 2 metres

MM106

3.6m

3m

No

Semi-vigorous rootstock producing a good half standard tree for medium to large gardens. Grows too strongly to be used as an espalier or cordon tree. High yielding with around 20 kilos of fruit from a mature tree each season. No stake needed after a few years. Growing conditions can be much tougher with poorer soils and a harsher climate and they will still produce a good crop. If the scion variety is weak growing it can help counteract this problem. Regular pruning can keep these trees to 2.5 metres

MM111

4.5m+

4m+

No

Vigorous rootstock producing a large tree for the larger garden. Slower to produce a crop, typically six years but then can produce 30 kilos of fruit per year once mature. No stake needed after a few years. Grows well in poorer soils and a harsher climate. Pruning this tree will require some climbing or the use of extension pruning saws etc. 

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