obnoxious plant
A plant that is so annoying it makes you want to hit it with a stick. It’s the kind of plant that you can’t even stand to look at.
That shrub is so perfectly trimmed, it’s like it’s trying to be perfect and it’s annoying.
That tree is so messy, it looks like it was hit by a tornado.
That flower is so obnoxious, I think it’s trying to take over my brain.