We have a fair sized callistemon but it has only produced about 4 flowers in all. The rest of the plant looks pretty healthy, lots of new growth at the ends of every shoot/branch, and from the abundance of old seed pods it looks as if it usually flowers a lot. So why not this year? Is it meant to be pruned? Should we prune the old seed pods off? Its such a shame as it would have been so pretty.
I have the exact same problem as you - i bought mine last year and did everything suggested on the label but few flowers this year - i can only think that i didn't fleece it over winter they need protection from the frost as its native climate is australia
I don't think you should prune it except a little bit straight after the flowers have faded. I think Chris might be right in calling frost damage - I'm pretty sure the flowers come on the tips of last year's growth - I'm no expert, but my Mum has one and she blames her lack of flowers on the cold snap.