These plants are a general nuisance, and are definetely not fun to have around in such abundance, especially in a mod that involves so much travelling. I realize they are intended to be an annoyance, but sometimes they can start to cause real problems, such as when doing parkour or climbing, or when running from an army of 40 enemy archers with broken armor. My suggestion is to remove the knockback while keeping the damage, or possibly increasing it to compensate. Or maybe add a system where when you run into too many, one of your hearts displays a small thorn icon for 2 minutes and you get slowness. It's just that for a plant that was meant to annoy you as much as they do in real life, they cause quite a bit more falling off cliffs.