Growing and flowering are two different things.
As the article mentions, some types of bamboo will flower only once every 100 odd years. When they do, they pollenate each-other and grow fruits and die.
In some parts of the world rats will feasts on these fruits, and rodent populations will explode, contributing to the "Bad Omen".
> Just stick it into the soil in the right conditions
When all the bamboo decides to flower and die at the same time, what exactly are you planning to stick in the ground?