need input

I have an idea for a story, but i've hit a snag as I'm not sure where to go with it.

Inspired by multiple tales of witches transforming men who have wronged them, (real or perceived), this tale begins with a man somehow upsetting a witch or her coven. They decide that since he's so offensive he will be made into something that makes the world 'a better place' and transforms him into a flower. As with other transformees, they quickly forget about him, and the flower wilts as winter sets in. However with spring, the witches notice a massive plant has taken over their herb garden, with ten foot long leaves and a massive bulb at the top. It opens up on the first day of may and reveals an alraune inside: a plant girl.

She is VERY angry at being transformed (understandably) and chases the witches away with pollen and vines (acting on instinct rather than actively choosing her powers, she's not entirely aware of what she is as of yet).

But this is where I hit my problem...I'm not really sure where to go from here. I know I want one witch to serve as a kind of antagonist who wants to just destroy the creature, while the other witches are hesitant: since shapeshifting someone is one thing but murdering them outright is quite another...and it's hard to find any justification since their original punishment is still intact: the man was turned into a flower. The fact that it's a sentient flower doesn't change that it's still a flower.

I'm also going back and forth on whether or not I want the new alraune to be able to speak english or if they would speak some kind of chirping/singing language that humans can't easily translate.

I do want our victim/heroine to have genuinely done something wrong; I don't want to cop out and pretend that he is innocent. But whether or not that is deserving of such a harsh punishment is a different matter entirely.

So if i can get any ideas at all, any input, suggestions or any ideas where to take this, characters or anything really: please respond!