Thank you! I do love that little guy, ... "little" for A bamboo, though he is starting to loom over his neighbors in my yard.
>> Although our native soil is adobe clay (can that even be considered soil?), the soil along the fence line is deep leaf mulch from years of buildup so *hopefully* the bamboo will be happy.
From what I read, bamboo loves organic mulch. So I assume it will love the organic soil. Also from reading (somewhere), I hear that either this variety or most Fargesia do not need very thick soil, that their rhizomes stay within 4-6" of the surface.
When I read that the rhizomes stayed near the surface, I stopped amending the soil.
(But I do have good drainage, since that raised bed is at the top of a tiny slope in my front yard. I agree with you that you need drainage before you can even improve the soil. )