The importance of aftercare
/From planting/ transplanting, the period until the tree has developed a root system equal to that of a natural tree and it can look after itself, will need assistance.
In addition if the planting site is sub optimal, for example hard surfaces, restricted rooting area, not suited to planting conditions….. The tree might always need assistance.
The assistance is to compensate for reduced root system or restricted rooting area / planting conditions.
It is primarily satisfactory watering, optimal Soil Biology and mulching to feed the Soil Food Web as it composts down.
Without assistance unless very benign weather for years, they are likely to fail.