HELP! My fuchsias
 

Hi, Last summer during the heat wave, all my Fuchsias on my balcony withered
and died, even though I tried to keep them cool with spraying.
Can anyone tell me what the maximum full sun temperature that they can
tolerate outdoors is?. And do you have any 'high temperature' tips please?
I live in London.
Thanks
Bjazz.