Spring means: rhizome pruning!
I'm a little ahead of myself as spring is not actually here yet, but late winter is when I prune the rhizomes on my bamboos. This must be done at least once a year (better if I do it a second time in the fall though) in order to keep the bamboos from taking over the garden and my neighbors' yards.
My large bamboos all have a mulch-filled trench around them in order to make this task easier, and the mattock is my tool of choice to find and cut those escaped rhizomes. The tool is actually resting in the trench in the above photo.