Robots can take on the task
Robots can take on the task on performing permaculture. If powered by abundant, clean electricity, whether cold fusion, LENR, CIHT, Controlled Intermediate Nuclear Fusion, Aneutronic Hot Fusion, or direct conversion of subatomic particle mass into electricity, there is no reason to avoid supposedly less efficient agricultural techniques. There are enough not-so-wild opportunities out there in the realm of new energy physics that the problem of energy will largely dealt with before it becomes normal to have robotic permaculturists. We don't have to give up technology or the entire time of day, for the sake of sustainability. We can have it all.