maintenance of my bamboo is a monthly thing. I try to change the water and wash the rocks monthly. Then once a year (yesterday) i did the whole shebang. 

I have the oldest bamboo in its original pot that my parents gave me for x-mas about 5 years back. It is beautifully tall and i want my whole house to have lots of bamboo so i have been handling it with kid gloves.

so as for the maintenance i did to it last year, well i first took the parent plant out, cut off a few branches to propagate new plants and placed those in just plain water without rocks. well the parent plant now has produced new branches. but i never got around to putting in rocks on last years cuttings. SO i have done this so far

cut off the new branches for propagation

cleaned up the parent plant and washed out the rocks

put rocks into last years cuttings (hopefully they will survive)

then planted the new cutting in rocks and have them in a waterfall in my kitchen.

i started with 5 stalks, now i have 10 and hope to have more next year.