Yes, back home they are wild flowers along the roadside and it was hot, humid in summer 36C easily .. Don't worry, about it being in a shady area as granted the right humidity, they self seed and I have always noticed that plants have legs and will self seed in a kind of mini explosion in areas suitable for them. My cerinthes have already WALKED to their favourite spots and the alstroemerias gone back to the kerb stones, AGAIN! Much to my annoyance as growing there will enable even old respectable-looking ladies to pinch your seeds..
I'm really not worried about the shade killing it, in fact it would be a small favor if it did as I'm still just not crazy about it. The little flowers are pretty but the rest of it looks like a weed to me. If it pops up anywhere else I will certainly remove it, but I have not seen any evidence of that.
