The photograph on the right is an isolated flowering of Tea Stick Bamboo.
Bamboo flowers rarely and for many species this is a once in a century event or more. Consequently, seed is largely unavailable.
To grow more bamboo, the same clone is continuously divided up and supplied to the four corners. Bizarrely, when a bamboo species flowers, it does so in unison world wide. And once a bamboo flowers it usually dies. A clue to deciding where a species of bamboo originated is that here not all plants will flower at the same time. Growing from seed results in genetic variety.