When and how do you prune Totem pole cactus?

Question

Totem Pole cactus in my yard have gotten too tall ( 12 feet height) they are breaking off into the neighbor’s yard.

Answer 1

This article should help with your pruning:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-pruning-info.htm