First, the lower leaves started turning yellow muc...

Thats the classic signs of heat stress , your plants essentially burning up because its being exposed to hot sun all day long . Firstly Im not sure if your plant is in a pot or its actually in the ground . If its in a pot you can move your plant to a more shady location during the middle of the day when the sun is the hottest in order to help control this , or you can build yourself what I like to call a 4 post . its essentially 4 wooden posts and then you take screen and cover the top so it helps shade your plant and absorb the high heats from the sun resulting in a cooler growing environment for your plant(s) . If your plant is in the ground I would advise the 4 post method to help keep her cool and water her more frequently on hot days . Try not to water the plant itself as the beads of water will act like a magnifying glass and will do the exact opposite of what your trying to do which is cool the plant down . Usually when deciding to grow outdoors location plays a big part on success especially if you cant tend to them everyday . The ideal location would be to have it somewhere it abosrbs all the light in the morning then in the afternoon its shaded abit by some tree and then around 3pm it starts to get full light again until sundown . I hope this information helps you along your journey of out door growing ! - Happy Growing!

Hey there, so i see you've had steadily rising high temps from around week 8? Which is unfortunate they're responding this qay because usually they get acclimated over time. But i see some serious " taco" leaves showing up in last week before the browning. Id say try giving your plant a kelp product (not seaweed if you can find) and then water at night or 1st thing in the am, and then check the afternoon for possibly a second watering even with just plain water to keep cool. Also try soaking the ground around the plants for added cool. I fight the outdoor battle too in the 100s and i think just try to stay vigilant, maybe provide some shade if possible too. ✌️ good luck with the battle.

I don’t really find those leaves as yellow or discoloured in the middle so I don’t think it is Potassium deficiency, and there isn’t noticable purple stems/veins, or dark/blue leaves to indicate Phosphorous deficiency; with the nutes you are feeding I would say its less likely deficiency than excess. I concur with Mrs_Larimar that it probably has to do with the hot weather, and drying increasing the nutrient concentration/altering the pH. As another observation I would point out your leaves look “tacoed” or “canoed,” the outside ridges are curved upwards on each leaf. This is a response to hot/high temperatures. 34 degrees celsius is hot!

I thinks the cause is the higher temps, the water dried faster and nutrients get more concentrated/ the PH changed. But thats only a guessing. But sounds plausible to me. Try to dilute your nutrients, or feed less and give more often. I think that can help. To me it looks burnt because of PH problems due the warm weather/ fast drying medium