Soft, turning stems.

Hi friends,
I came home today and saw that one of my plants had started to turn her flowers down, looked super weird and when i touched them they felt Limp, had no structure on them, soft as hell.
The plant in question already was a suspect plant, it was the smallest of the bunch and its main stem had a weird curvature witch i thought was from the wind but apparently, it might be the same thing.

Now I am pretty sure my plants have ph and drainage issues. I just bought a ph meter. And il try to use it tomorrow( still have to understand how to calibrate it and how do you even measure soil!? ... ph...)

Anyways i am afraid that it gets worse so any suggestions?


Cant post normal links for some reson.. so i uploaded 1 picture....

the plant is darker green color as well then the other plants and seems to be very resistant to pests compared to other ones..

Looks thirsty.

Same thought that I had...the leaves just look to nice and green for it to be a nute problem, but I could be wrong. In the summertime heat, smaller sized containers can dry out multiple times in 1 day...she's at a stage where she's drinking more than she ever has, and a plant that big and healthy will drink a bunch. From your leaves being nice and green I doubt you've ph issues...just keep her well supplied with water. Unless you meant that it is staying too wet, I may've misunderstood.