I don't know the answer to this, but I do know that honey bees "like" some people and are less likely to sting them, whereas other people they didn't like and would immediately get aggressive. And this is regardless of the color of their clothes - which does affect their behavior. I would imagine it has to do with the person's own chemistry, and maybe their diet.
There are so many variables when it comes to plants - hydration and humidity, dust, chemistry/pH of the soil, light, and heat.
It might be the type of plant - some plants are easier to take care of given a certain environment.
There have been studies showing plants do respond to being talked to. So the atmosphere around the plant MIGHT be related - negative emotions, smoking, etc. It would be interesting to experiment.