I started some Brugmansia Arborea seeds in my basement in March of 2014. As time passed, only one plant made it. I potted up as it got bigger and in 2014 it grew to about 3 feet or so. It was wintered over in my basement with everything else.
Now it is over 6 feet tall and has yet to form a Y. It does appear to have some branching forming, but no Ys. I know the difference and know what Ys look like from other Brugs.
Throughout its life it has been watered (daily in the summer) and fertilized adequately (weekly with 10-10-10 in summer). It is a handsome plant and has nice leaves and nice form. On my deck with other Brugs in full sun.
But no Y. Why? Is it just a matter of time? I am presuming as much and there is so little on this topic on the web. Will it be 9 ' tall before it Ys? Soon I am gonna say screw it and just make 3 or 4 cuttings from it and just go with that. It is my first attempt at seed.
Note that I made 2 cuttings last year from another Brug (NOID) taken from an awkward branch quite low which needed to go. These were definitely below any Ys. One died, but the other Yed at about 10 inches and it is now less than 30 " tall and has 12 blooms. Its stem is ~ 1/2 as wide as the Arborea.
Thanks. Perplexed and POed in Zone 5B.