Dave that is a great question! I have one lop sided blooms..lol It cracks me up...One side blooms and the other side nothing...Hmmm We need a expert here... Thanks for asking this..Barb

Well, from what I gather in my own experience here is;
Each trunk has to grow and Y. Even if a brug has multiple trunks, they arent necessarily all going to Y at the same time. I like the multi-trunked ones for just that reason. While the main/first trunk may be done blooming and setting up for another flush, another trunk may be ready to go..giving you blooms while the other has none and is setting up for round 2.
Even better if you have 4 doing this, no? My one has 5 trunks, and bloomed for over 9 weeks, stopped for maybe 2 or 3 now, and is getting ready to go again.

Single trunks, you are going to get less blooms because you have less plant.
With my brugs I havent noticed any difference in respect to blooming time in single trunk versus multi trunked. I have 2 Cherubs. Both bought together last June or July, and they were both the same size. Both didnt bloom at all last year. This year; One is multi trunked..3 or 4. The other I kept to one single trunk. Though it is now putting up new growth from the soil.
They are both the same height, and both have 1-2" buds on them.
Does that help at all?

I think people like single trunk for the look. And some folks believe that the single trunk will allow more nutrients, water, etc to all go to ONE trunk, therefore make that one trunk stronger and bloom better. I dont necessarily agree. If a brug puts out more trunks, it is obviously happy, AND it Does have the roots to support this new growth, roots grow and the plants grow.
I think, now this is all my opinion mind you..Just because a brug has enough roots to support multiple trunks, and starts poppin em out, doesnt mean that if you remove all the other trunks, that ALL those roots will support the single trunk and speed up growing and blooming.
Some of the roots will of course, but not all of them. The roots that aren't needed, would die off I would think..if the new growth keeps getting pruned, why do those extra roots need to be there. Eventually the plant will give up trying to replace that lost growth, those extra roots wont be needed. Am I making sense? lol. It works in my head.

I dont know, lol. the way I see it is, the more plant you have, the more blooms you have. Like I said about my Cherubs, I havent seen any difference, between the two.

I will say though that I think leaving all the leaves on a brug instead of making it a standard look, helps the brug to grow faster, therefore reach a Y faster and bloom faster. All those leaves make food for the plant. If you are pulling them off for a standard look, you only leave the top leaves to gather what the plant needs from the sun. The more leaves, the healthier it is, and faster the brug grows. Last year I kept mine all pruned to standard form, they hardly grew and I had only a few blooms. This year I left all the leaves on most of them, the ones I left the leaves alone..they grew like there was no tomorrow, I have had blooms since late spring. I have only been taking off the lower leaves when I wanna see the blooms better.

Now I have a lot of brugs that only have their tops/canopies, cuz I figured what the heck, they are all about to bloom, and I will have to be stripping them soon enough to bring them in anyway. I do like the standard look, but I also like the look of a big full healthy looking plant, I like brugs' BIG leaves.
just my opinion..I may be wrong..but its what has been working for me, and what I see in my brugs here in my yard.

Dani, what a great explanation. It makes perfect sense to me. Darn I wish I had 100 plants to experiment with. But I don't have the space and location to grow them. That's why I enjoy being able to participate in YOUR experiences so much.
Ingrid.

Thanks daniellalell. I think your points make sense.

This is my first year growing brugmansia. I have 2 plants, one pink beauty and the other one a yellow/golden. Of course these are 2 different brug varieties and their blooming habits are likely decided by genetics. However, they line up with their growing habit.

The yellow has a neat growing habit, with 3 or 4 stems growing quite upright. The pink beauty has far more stems and they kind of grow side-up, not looking so neat as the yellow one. It grows more leaves, and the leaves are of a much deeper green. It has bloomed almost non-stop, producing a lot more flowers than the yellow.

I still like my yellow brug a lot. It blooms reasonably well, and it smells wonderful. The fragrance definitely beats the red beauty. A couple flowers will fill my front porch nicely.

Changsong

Thank you for the vast knowledge!
Kasha77