A rare plant known as the corpse flower bloomed in Sydney on Friday for the first time in more than a decade, emitting an odour likened to rotting flesh and delighting thousands who queued for a whiff.

Corpse flower blooms are often inconsistent. Many will bloom once a decade, though sometimes even more frequently.

The bloom has attracted up to 20,000 admirers who filed past, hoping to experience the smell for themselves, with some attendees describing it as "like death," "like poop," and "like sewage water."