I would char it first. try and get some charcoal activation going by using a reducing fire, making
biochar pipes.
Tempting to put
wood and some rocks down at the base for a storage cistern too.
The vertical channel idea is good, but some other folks have found that the
roots like to grow down in between the heartwood and the bark, the sweet spot.
So, char bamboo in fire, smother with dirt.
Dig pit, lay in some wood, and some rocks for water spaces. put in some myco-rhizo starter too.
soak bamboo biosticks with
compost tea. drive em in on 1 ft centers, or even better, on periphery to channel water down to base of plants and cistern, so you dont have rocks in middle of bed ?