Gwen, I can't remember a time when the tibouchina hasn't been without a flower - sometimes it only has half a dozen flowers but never less.
Mary-Anne, Tib Elsa can get a little straggly so I do give it a light trim occasionally. I win't be pruning this hibiscus as it is the one the dog used to eat all the time... it is the first time it has actually had lots of leaves on it
We did prune all the others back last weekend, all about a metre high now - many were over 2m.
Our walking iris is in a very dry area so doesn't seem to grow that quick... luckily. Those dietes, particularly the white one doesn't know how to stop flowering. The lemon seems to get quite a few flowers then stops for a few weeks then flowers again. The purple iris (you can just see one behind the furtherest dietes, there is another one just off the right of the picture) seems to have finished flowering now... but it does deserve a break as it put on a beautiful display.