
.... another thing in play is the heat/lowRH% , which I assume as well? This has significant negative consequences on transpiration rates; too hot/dry and the plant may close up the stomata to prevent severe water losses, which in turn restricts the flow of water and nutrients from roots to leaves,.. this can cause the physical reactions you see on the leaves, and the defc. symptoms... unless the plant looked this color before? This could be a few things, but overall yellowing hints at S defc. possibly,...In any case, this can happen fairly slowly too, over successive hot days,... You can throw some screening material over her to reduce the intensity and heat during the worst part of the day,... misting often can help too, even if it's a pain,...