I just woke up from a nightmare where I was pulling long stalks of invasive grass in my yard, and the worst part was when I looked down and saw this other random common weed. I just had this visceral aversion to it and felt like it would attack me.
This dream got me thinking back to all the other times I've been unusually scared of plants. As a kid, I had an intense fear of most leaves, especially sassafras leaves (which I'm still terrified of). I used to get nightmares and intrusive thoughts that I was trapped in a white void surrounded by sassafras leaves and unable to close my eyes, and even now, I cannot look at a sassafras tree. Just thinking about them freaks me out. The leaves...the way they are shaped like uncanny hands...
Just a few weeks ago, I was cleaning up a stream valley and encountered a bunch of stringy white roots and it really freaked me out as well. More so than the snake I also ran away from.
I grew up and still live in a very luscious area, and I haven't ever been completely overtaken by a fear of plants, so I don't know if this can really qualify as a phobia, but it's just interesting to consider that I might have some sort of fear of plants.