But what does all of this greywater stuff have to do with permaculture’s “branching” pattern. Branching is often about distributing energy evenly--just as this plant-start likes to do. In the case of the greywater system just described, like the very small sapling, it has a long stem with a number of short branches. Other greywater systems that we have designed and installed have much shorter distribution stems (trunks) and much longer branches. The big factors involved in determining the ratio of primary trunk/stem to secondary/tertiary branches are gravity, geology, existing structures, existing plant material, and the needs and desires of our clients.