I've waited seven years for this.
Back in 2007 I bought a small plant of giant fennel Ferula communis, when I was mainly attracted by its delightful, ferny, four-pinnate foliage but also tempted by the promise of a giant inflorescence.
It's also a very good 'bee-plant' attracting a constant procession of bumblebee visitors to these umbels, each of which is as big as my fist.
Worth waiting for!
Giant fennel is monocarpic and the plant will die after flowering, but I'm tempted to try that stem as a home-made Olympic torch....