Hi Phil, The information that you require is about Alloxylon flameum (Note name change), Tree Waratah. I found the information on the Website listed below. It says that they will tolerate moderate frost. In one of my reference books it states that a plant is said to be frost tolerant if it copes with temperatures to -7C. It seems that your Tree Waratah may be fine in your conditions.

Here is a link that might be useful: NSW Mt Annan Botanic Gardens

Thank you "Mallee"for your comment,and congratulation for your web page,talking about "Banksia" quite interesting!
I do agree with you,with the fact that many Banksia are very adaptable....i have a tendency alcaline soil,and grow,without modification,in this soil,since 6 years,"Banksia prionotes,and cocinea,none is flowering
Cheers
phil

Cold tolerant is not the same thing as frost tolerant. I'd be more comfortable seeing your lovely alloxylum protected from frost until it's up above the frost level - maybe a few metres high. It's a tree that's well worth the trouble!
Trish

I don't know what it is anywhere else however in South Australia -7C is most definitely a frost as well as being very cold!

I grow Alloxylon flammeums in Sydney from seed. They definitely resent Sydney winters and in our area we get no frosts at all. After about 3 years there cold tolerance seems to . Protecting them from cold winds is important as is keeping them well mulched.

Thank you so much "Gonow, Mallee,and Trish,for your advices!
phil