M9Dwarf M9 class rootstock

The traditional and best-known dwarfing rootstock.

It should be planted on a fertile, well-drained site with a consistent, ample moisture supply.  Very poor tolerance of waterlogged soils.

Do not grow this rootstock on light-textured soils, such as sandy loam, without supplemental irrigation. ‘M.9' needs a grass and weed free growing area. Avoid shallow planting, roots break easily.

The tree itself also has brittle wood.

The rootstock overgrows the scion making a lump on the main leader.

Trees on ‘M.9' are very productive, however, the original ‘M.9'clone contained viruses that produced a tree about 30% smaller than the virus-negative ‘M.9 EMLA'.

Used for high-density plantings, it induces extremely heavy, early cropping and larger fruit.

It is reported that in Lithuania, ‘M.9'offers the highest cumulative yield efficiency (CYE) and productivity. However, just further north in Latvia, ‘M.9' does poorly.

‘M.9' is very resistant to Southern Blight.