I think the problem happens when you don't know the plant. I also have some trouble until I know how the plant looks when it's happy and how it changes when it'

I think the problem happens when you don't know the plant. I also have some trouble until I know how the plant looks when it's happy and how it changes when it's not. It's a very small difference in some cases, but if you look at it every day you just.. know after some time. Apart from the supposedly easy one I have that is always unhappy no matter what I do. And yet it refuses to die, it only.. almost dies. For years now.