Sudden deterioration and death

Was your drip system clogged by chance? I had issues with the hoses getting clogged back in the day because of the nutrients... and otherwise, it looks like root rot or rather root death.

Hi, seeing as there are no yellow leaves on the adjacent sunflower, I would confidently say its a complete lack of water, when its hot leafy plants transpire like crazy...that water need to be replaced. Perhaps in future a good layer of mulch or straw on the top of soil would retain moisture better and if you could somehow keep those fabric pots out of the drying wind as well because they are worse than terracotta for rapid evaporation. Perhaps a capillary wick system would suit your method..that way you can be confident the plants can access all the water they like and have the wherewithal to withstand a bit of heat. Good Luck!

You get that when you dry them out and don't water them too bad could have been quite something .....

So, in your diary it says "I didn't have to water them".......

are they pulling our chain? 😆

I think it's a lack of water. When the soil is too dry and you water it, the water doesn't soak into the soil and just runs right through. Despite the watering, I think the water wasn't retained by the soil, so your plant ended up thirsty.

Water the poor thing, it's drying out.

Yes, unfortunately she dried out due the hot weather and not enough water. Give her a good amount of water now like 30% of your pot volume. And when her leaves are hydrated again then cut the brown leaves and water her every morning when it is really hot outside. Then 10 - 20% of your pot volume will do. Goodluck!

omg... how terribly SAD!!! Heat will do that, yes it will... but had you noticed anything like fungus gnats or other critters that might have been chewing on the roots? Oh that just makes me want to cry! And I feel your pain - the heat and humidity did in two of my plants ... sigh... Hope you have others that are still alive and kicking?