My Mauve Mist Callistemon has never flowered the bush is growing very well lovely green leaves rather tall bush, in a sunny position. No flowers been in ground for several years.
Hey Helen, there's three possible reasons for the lack of flowers on Calliastemon
#1. Not enough sunshine - they need a full sun location though a little shade throughout the day is OK too. But yours seems to be correctly placed.
#2. Make sure it is getting balanced fertilisation. It sounds like its getting plenty of nitrogen (green leaves) but that can sometimes encourage all its energy to go to leaf production at the expense of flowers. Best to use a 'Native' formulated fertiliser like 'Bush Tucker' - see link below.
#3. Regular tip pruning is good to encourage bushy growth but you must be careful not to prune prior to flowering, as the new buds will be cut off and generally the shrub won't produce more until next season.
Sounds like #2. or #3. for you Helen.
Here's the link to 'Bush Tucker' in the GardensOnline shop:-
https://www.gardensonline.com.au/Shopping/GardenShop/Show_6325.aspx
And this is what the blooms will look like once you've got your maintenance regime right. Worth waiting for Helen.