This Clivia miniata was given to me about five years ago, it has been a long wait for the first flower IMG_1089 by atropica2012, on Flickr
I've had a Doryanthes palmeri plant from seed for about the same length of time and reckon it will be another four or five years before it is large enough to flower.
What 'first flowers' have you been waiting for?
My Drimys winteri finally flowered this Spring, 12 years after I planted a rooted cutting that I layered from a plant that is still growing at my old place. That one doesn't flower much either.
And I bought a Hemerocallis citrina 'Baroni' at Beth Chatto's garden in 2003 that managed to get trashed, stomped, chewed and shaded out in a succession of locations - a real hard-luck-story plant. I rescued some fragments, scarcely more than root-cuttings, into a couple of pots about 4 years ago and planted them out 2 years ago in a spot where they don't get so much abuse. They finally rewarded me with a couple of flowering stems last Summer.
I am not currently winning on the length of time, but I have been growing agaves for 6 years now and have yet to have a single flower on any of my plants. :lol: