In area with higher rainfall it is very important to select varieties with high resistance to bacterial canker and scab, the two most common diseases affecting apple trees in Ireland
All our varieties have some resistance both of these.
The next choice is rootstock this will affect the size the tree will grow to.
The bigger the rootstock the longer the wait for the tree to fruit and the longer the tree will live
For example M9 will stop producing in less than 20 years where as MM111 can keep going for 100+ years. The smaller the rootstock the more likely there will be some disease as they are being restricted from their natural vigour.
Apple tree root stock diagram
M27 – Very Dwarfing
Grow to 1.7m (6 feet). Requires good staking and good soil. Root-zone to be kept weed-free. Plant 2 metres apart or in a large pot.
M9 – Dwarfing
Grow to 2.2m (8 feet). Requires good staking and good soil. Root-zone to be kept weed-free. Plant 2.5 metres apart or in a large pot.
M26 – Semi-Dwarfing
Grow to 3m (10 feet) and fruit in 3-4 years. Plant 3m apart.
MM106 – Semi-Vigorous
Grow to 4.5m (15 feet) and fruit in 5 yrs approx. Plant 5 m apart.
MM111 – Very Vigorous
Grow to 5m plus. Tolerate poorer and wetter soils. Plant at least 6 m apart. Fruit in 6 to 8 yrs.