All the Callistemon's that we grow (except C. Littlejohn) seem to be fairly robust. Through trial and error, we have found it best not to put plants outside that have soft new growth late in the season - as it gets damaged by frost.
If however the wood is hardened they are fine.
In the late spring, this years plants outside in 3 litre pots withstood 5-7degrees of frost with no damage.
A well drained soil to stop water-logging and a sunny site is required. If soft growth is caught by frost, it can just be pruned out, with no detrimental effect to the plant.
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