How to get branch outs from a single stem?
I am new here and am looking for some help with my plumeria plants. I have 5 small plants which were started from the clippings you buy from Hawaii. Four of them are 2 years old and one is a year old. I just repotted them in 8in pots with a mixture if potting soil and sand with small rocks set in the bottom of the pot for drainage. They are all roughly the same size (12-14in with 10 or so leaves). Each winter the leave fall and grow back when I move them outside for the summer.
I would like some information on getting them to branch out. Like I said they are all one single stalk and only one flowered since I had them. Also when is a good time to fertilize and what type should I use.
Thank you in advance!