Hi plainsane, and thanks for your response!
While you're absolutely right, bamboos can be very resilient to stress, it angers them and makes them unruly to live with in my experience, so I try to avoid it at all costs being naturally lazy as I am.
I'm trying to avoid causing Rachio to underestimate my beds' evaporation rates, and the bamboos' transporation rate because of inaccurate input from me.
If I startle, spook, or otherwise annoy this bamboo, it will use it's not insignificant growing prowess to go looking for whatever I've neglected to give it enough of - water, sun, nutrients, unattended neighborhood pets, the usual. (Notice the newly rebuilt corner on the wall? I left 1 cane I shouldn't have, 5' away for 6 months with a few hot days.)
For those of us playing along at home, here's the game:
This is my 3-year-old P. vivax bed with species and 2 cultivars:
How do I explain this plant to Rachio?
Each mature bamboo cane (P. vivax) is a 4-5-inch diameter grass that grows more than 6 inches a day for about 100 days out of what is effectively a 2 cubic foot terracotta pot of soil. A lot of plant and canopy in very little soil. (30' Area X 18" RZ) / 25 canes = 1.8 cubic feet per cane. It's more complex than that, but that's good enough for baseline.
The soil is 60% 5f soil mix (33% Fine Bark / 33% Peat Moss / 33% Pumice), hand-triple-dug into panned native clay to a depth of ~48". 6" steer manure mulched on top of soil (grass snacks/moisture retention).
Thoughts on how to compensate for these walls?
The bed's walls are oriented SE/SW and are extremely porous and HOT. They're about 32" tall, ~18" deep, dry-stacked lump basalt infilled with quarter minus aggregate. Behind the wall is a sand trap (~12" wide / ~18" deep).
I'm just trying to understand how Rachio thinks so I don't hurt too much while I'm learning.