I don't know if you do that in the U.S, but here in France we have a technique of pruning for apple trees (and other) called "Espalier". We use this technique since Middle Age :
The aim is to :
- gain space
- put trees against walls (this way get the heat from it, which increase sugar in fruits)
- less bugs
- get the same amount of light as a normal tree
- trees live longer (because of the wall)
Here is a link in English :
http://www.amarmieli...ruit-trees.html
I'm wondering if it's possible with a pepper ....