The seemingly peaceful, unsuspecting, and black-bamboo-free shady driveway border, which last year was overrun with unwanted black bamboo shoots:
And lurking behind it, a huge 2" / 5cm wide shoot has pushed its way up through the retaining wall! It grew to this height in about four days. I first noticed it after it knocked over a potted plant in the process of emerging. Behind the shoots is a heavy piece of cement which the shoot just brushed aside.
At the base of the retaining wall is a small area in pavers where I access the hose bib and sometimes store potted plants. Two more equally large shoots have pushed aside a few pavers. There are a few other lumps in the paved area, so I suspect more bamboo drama awaits.
More pickaxe work is clearly in my near future. Alas.