I have some young apple trees - some planted last year, some 3 or 4 years ago - that are in various stages of limb development. If I want to end up with bottom limbs that are 5' or 6' off the ground, do I just keep pruning the lowest limbs until I achieve that? Or do I " let some wood " on to make leaves & soak up the sun to encourage more growth? If I cut off the lowest limbs, will that make the tree push upward so newer limbs will be higher to become scaffolds? I have time, $$$, & sweat invested so I don't want to mess it up now by making the wrong move. APPLE GUYS ??? Thanks in advance for any & all help.