I have a 4.5' plumeria that has zero branches. It has huge leaves and is finally growing a flower stalk. But I want my plumerias to have lots of branches not just be super tall. How do I make it (and eventually my smaller plumerias) branch?? Also, my smaller plumerias are not growing. Not dying but not growing. Im in Phoenix AZ. They have tons of light, cactus mix and perlite, erosion salts, i water and then let it dry, I've just done fish emulsion... what do i do to make them grow? Thank you for your help im desperate to have a backyard full of frangipanis!