On Fri, 15 Jun 2007 17:24:38 GMT, Jerry Bank
wrote:

I have two plumerias. One of them refuses to branch. I have beheaded it
a number of times, but each time just a single branch arises from below
the cut. Is there any way I can get anything but a tall skinny plant?

Stop beheading it and just remove the very tip of the branch you DO
have and that is where the apical dominance is, meaning there is a
hormone which is halted at the growing tip, forcing growth lower or
elsewhere on the plant for a time.