The wavy shape naturally curdles the flow of juice. This has two advantages:
The growth in the head is suppressed.
Vegetative growth and flower bud formation (fruiting) are evenly distributed along the frame branch.
Advice
The wave-shaped cord is easy to grow and maintain. To achieve a regular waveform, you should regularly tie the tree to a sturdy frame. Very suitable for espalier fruit with apple and pear. Similar to zigzag-shaped cord.