Giant fennel spectacle six years in the making

The plant I’m most excited about at the moment isn’t a succulent at all. It’s a giant fennel ( Ferula communis ), an herbaceous perennial from the Mediterranean with fine-cut arching foliage that dies back in the summer and reappears with the rains in the winter. I bought it from Annie’s Annuals in October 2019 in a 4-inch pot, and it’s finally flowering. As you’ll see below, this isn’t a dainty little thing; it’s a sturdy plant 4 ft. tall and wide, with a flower stalk that reaches a good 10 ft. into the sky. In fact, from a distance, the flower stalk looks a lot like that of an agave! Agave flower stalk? No, giant fennel! Based on what I’ve read, Ferula communis is most likely monocarpic, i.e. it will die after flowering and setting seed. Some sources, however, claim that the plant will live on if you remove the flower stalk before seeds are produced. I don’t know yet what I’ll do, but I’m tempted to let it complete its lifecycle to see what happens then. Below is a pictorial chronic...