Information about:

Root stocks

Refer to the Fruit Tree, Shrub and Ornamental Order form to see what type of rootstock you are buying.

from http://www.cameronnursery.com/products/rootstocks.htm
Malling 7 (M7)
    * A semi dwarf root about 5-10% larger than M26
    * Root suckers are the main detractor
    * In most soils tree support is a good idea, particularly in new plantings
    * This rootstock is winter hardy and adapts to a wide range of soils and management styles

Malling 26 EMLA(M26)
    * Standard semi dwarf rootstock, widely planted where more vigor is required
    * Precocious but fire blight susceptible
    * This is a good rootstock for medium density orchards with lower vigor scions
    * A clone of EMLA 26, M26 Adult, is a European selection that has fewer burr knots but other growth characteristics are the same

From “Growing apples and pears in Minnesota home gardens”

http://www.extension.umn.edu/distribution/horticulture/applepear.html

M.7a: (also: EMLA 7) This semi-dwarfing rootstock produces a tree 10-14 feet in height. Trees planted on M.7a generally do not require staking, except on windy sites. M.7a would seem to be a good compromise between the standard and truly dwarfing rootstocks. Although it is the least hardy of the group and may sustain damage during unusually cold, snowless winters, it has generally performed well in our climate. It has a tendency to sucker profusely.

M.26: (also: EMLA 26) This dwarfing rootstock produces a tree 8-10 feet in height. Trees planted on M.26 generally require staking for the first few years of growth or, on windy sites, for the life of the tree. M.26 is reliably hardy, does not sucker as much as M.7a, but is especially susceptible to fire blight, a disease that can shorten the life of the tree if not carefully managed. Fruit is produced very early in the tree’s life, sometimes within three years from planting.

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