Tropicals & Tender Perennials: What makes a brug be a 'tree' or a 'shrub'?, 1 by dyzzypyxxy

dyzzypyxxy wrote:
Hey folks, I started with two cuttings this spring in April. Both from the same DG member, joeswife. (thanks again, Debra) They both took off and grew wonderfully, but the pink one 'Cherub' grew one stem straight up to 6ft., then put on a Y and started blooming. It is now over 7ft. tall, on it's 4th or 5th bloom cycle and has another tall, straight shoot coming up from the base. The other which Debra calls 'Monster White' made a Y at about 2ft. It has kept branching, and is now this lovely shrub. It's 4th bloom cycle about to begin tonight!

Does anyone know why the two would grow so differently? They grew side by side and had exactly the same conditions and care until about a month ago when 'Cherub' just got too tall, (kept falling over) so I planted it in the ground. I checked, and both had vegetative foliage - symmetrical leaves - down low. Not complaining, just curious!

Also, would it work to 'pinch' out the terminal tips on 'Cherub' to make her branch or would that just stop blooming?