I have some apple trees that have grown on their own and are now 30ft high. They are fruit bearing and I want to know how to prune them to a lower height so the fruit can be picked.
There are a number of factors that must be considered when pruning a mature fruit tree. One must consider the size of the limbs to be cut, does the tree require crown thinning and reduction, are there a number of branches that are crossing over. The general rule when pruning is to never remove more than one third of the limbs at anyone time.
I would recommend calling a certified arborist for a consultation.