Air Pruning Beds

Air pruning systems take advantage of the natural response that root tips have when they contact air. A growing root tip will stop growing, and the tip will shrivel, effectively going dormant when it comes into contact with air. This event creates a hormonal signal that back-propagates up the root back towards the stem-root junction and initiates new root growth in the form of branching roots and new roots emerging from the junction itself. In this way, air pruning induces the creation of vast numbers of fibrous roots all heading in their own direction. Whenever a root encounters the edge or bottom of the pot, it self-prunes and sends that hormonal signal back towards the stem-root junction, inducing further branching.

Twisted Tree Farm
Akiva Silver
https://www.twisted-tree.net/
https://www.youtube.com/channel/UCRaTsz4gmlE6OVEuOKOE4Ow
http://www.twisted-tree.net/abundant-propagation/abundant-propagation
http://www.twisted-tree.net/books/trees-of-power

Edible Acres
https://www.edibleacres.org/
https://www.youtube.com/c/edibleacres