If your bamboo has flowered and looks dead then welcome to this mystical world, the curse of the flowering bamboo.
This mainly affects the Phyllostachys species, when one flowers, they all flower. Next door, up the road, the next town, across London. Mass hysteria normally follows as to what on earth has happened to all this bamboo, a disease, an visit from outer space, a bamboo hating gorilla team!
And the reasons why? even when studying for one of my horticulture courses years ago our lecturer insisted, in the style of QI "nobody knows" why it happens. Well as a level headed person it can only be down to the weather that year or the previous year. There is'nt some sort of genetic code imprinted in the living tissue of a bamboo or some scent carried by the wind to tell all bamboos to die in the same season, it stands to reason it has to do with the weather pattern.
When you look at bamboo you think tough plant, loves the sun, drought tolerant, plant it anywhere. I can't blame people for thinking that either, bamboo just has that look of being a tough plant! Quite the opposite really especially with Phyllostachys, they need the right soil, just the right amount of light each day, some sun, preferably not mid-day, and plenty of water, not a weekly soak but in the heat of summer, everyday.
So what of my flowering bamboo, is it dead?
No, I do not beleive it is. Sometime ago I cut a Phyllostachys nigra (black bamboo) back to the ground and never got round to digging up the root ball, a year later it had fully recovered and was sending up plenty of new canes. I have one in a pot now in my own back garden that flowered last year and with the mild spell in November it started to showsome promising interesting leaf growth, small leaves, not many but it's not dead!
My advice is if it is a small garden and the bamboo serves as a focal point plant then of course dig it up and replace it but in a larger garden give it a chance and some tlc, after all Phyllostachys nigra (black bamboo) is the most expensive of bamboos.

