Hi Toni
clerodendrums flower on new growth and best in the sun and like to be moist. Here's a link that might be useful.

Here is a link that might be useful: aol, vines & climbers

My experience with this vine was that it was dormant a good part of the year and just when i thought it was dead ...Bang! Trim it back, leave some growth and nodes, definitely cut off any parts that are no longer green inside.It is my favorite clerodendron and always got lots of oohs and aahs.I cut it back each year when all flowering was over.

Red, nice site..thanks..
Holedigger, when you say dormant, do you mean growth stops? My leaves are evergreen..Now I'm confused because the site Red posted, said plant can flower in winter.
How much and when is the best time to prune? Should I do so now? Right now, all leaves are green..
Because it's never flowered I'm confused of when to prune. I don't want ot cut back flowering stems, if any are on this yr..Should I prune now or wait until spring, and the plant is in a 10-12" pot..It's rather rootbound..Should I repot now or again, wait until spring? Thanks for all the help..Toni

I didn't know that this bloomed on new wood when I got it. Mine was in a part sunny summer spot/shady winter spot. I cut mine back every fall (once I figured things out) to the bottom of the trellis it was on, making sure to leave some growth. Mine would go dormant, no new growth and leafloss around october. I eventually planted a sweet olive in front of it to hide its winter sadness. Would you prune and then re-pot same day? Or, prune now and repot in the fall? Either way you need to encourage new growth for some spectacular flowers next year!

Toni
My clerodendrum goes dormant and used to lose its leaves also in winter. But since I moved it to a sheltered spot, it hasn't lost its leaves anymore. I have pruned it both in autumn after the flowers have died and in spring before it has started to grow. The cuttings can be used to propagate the plant (in a pot inside a zipper plastic bag).
Now I have a few of them and I experienced they flower and grow best in large containers and when pruned hard.

Here is a link that might be useful: botanyworld.com