Do plants feel stressed? Well, yes and no. Actually I’m not going to tell you that they don’t feel stress in ways similar to humans. There have been some studies where plants have had leaves hooked up to electrodes and then were pruned and there was evidence that they reacted.
There is also evidence that a plant under attack from an insect sends chemical signals to its neighbors. Is that stress? Is it a warning? We’re not quite sure.
But there’s this. Here’s a healthy, normal looking zygocactus (otherwise known as a non-blooming Christmas cactus).
Occasionally they look like this. This is what happens when they get too near a window (in other words, get chilled by glass–at least in my climate).
And there’s this, which is what happens if they’re getting too much sunlight.
Are they stressed? Somewhat, but not so much that they might be overly susceptible to insects or disease (which is what happens when a plant is stressed).
And then there’s this. This probably doesn’t look all that odd to you, because these zygo cactus can bloom randomly throughout the year.
But this is ‘Holiday Cheer’ the first of the plants to bloom for me. It bloomed for me last October. I remember posting a photo with it’s tag and the rather snarky comment “what holiday?”
I would say that it’s the Columbus Day/Easter cactus but Easter cacti are an entirely different genus!