As someone who has actually used her,maxed her, and is not just trying to state what she's intended to be used for. Her DoT is terrible. Nobody uses her, because why use a DoT Character like that when hers is the weakest that exists. If you seriously think she doesn't need a buff then you need to actually play as her, and then the others sunflower variants, and reevaluate what you said. Because it's not anywhere, not nearly as true as you make it seem. Her raw damage potential is so poor, the poorest of all sunflowers, it's no wonder she is never used. 3 damage ticks... It would take 2 ticks just to equal a fire tick. That's weak as hell.
It takes 3 ticks to do 9 damage. I didn't even do 10 damage. I'm sorry, but fire can rip through people like its nothing, and quickly, and is guaranteed to hit.. And the there's no getting around it. Spore is insanely weak and moving players don't even get affected by it. They pass into and out of it with 3-6 damage done. Lightning is better for group damage dealing, or even like a toxic pea who can poison multiple people at once. The alien Flowers spore mist is so insanely weak because it's not even guaranteed to do anything and when it does its insignificant damage. Like seriously nothing.
I think people try her out, because she seems interesting, but she's terrible so no one sticks with her. Again, Fire Flower has a real DoT that's actually effective. But whatever. Your mentality is what is keeping this game from even being remotely balanced... I think this game is pretty much on the verge of being dead anyway.