Beginner Gardening: Cassia corymbosa: Will it withstand freezes?, 1 by gabrielduerr55

gabrielduerr55 wrote:
Dear green thumbs,

I have got a Cassia corymbosa, already tall as I am which I have grown out of a seed in a
falsely declared Cassia fistula (manna) fruit/bean. This winter I thought that it maybe could withstand frost. On Daves' Garden's website I found the annotation that Cassia corymbosa is frost tolerant down to -18°C. Round here it won't get below -10°C .
Can I really trust this information?
Best regards
Gabriel Duerr from Switzerland