We have now started using a new type of pot with many of our trees, and these new containers are called 'slot pots'. This type of pot is much better than the conventional container because it is specificallydesigned to stop the roots from spiralling in the pot, and thus preventing the tree from becoming pot bound. The slot pots create a healthy root system that is perfect for re-planting, which therefore encourages your newly-planted trees to settle into their new environment.
The air slots encourage roots to grow in a different way by 'air pruning' them
through the slots, so when the roots grow outside
of the pot they become dehydrated which results in them producing more of the
finer fibrous roots inside the pot. The increase in the fibrous roots means that
the trees can soak up more water and more nutrients, which encourages growth.
Another benefit of these pots is that the slots facilitate good drainage all around the pot, and this is particularly important if you wanted to use the pots for hardwood cutting propagation.
We are now using slot pots with the majority of our larger trees and we are gradually replacing all of the conventional pots with the new slot pots.