u/lapolakita

hi all and thank you in advance! i'm growing cucumbers on my balcony and left them under my roommate's care for two and a half weeks. i came back and while they are still alive and producing cucumbers, they look ... sad for lack of a better term. there's been some harsh heat in nyc the past few weeks, however i asked that my roommate water them extra on the super hot days.
any insight as to what is making them lose leaves would be much appreciated! (and advice on how to bring them back to see better days)

thank youuuu!