Poisonous? Like a fox glove?

[With a younger sibling and cats around, Nel certainly thinks it a wise precaution to avoid potentially toxic species.]

Forget-me-nots are very pretty, but they can grow all over in your garden. [Her neighbor said as much! She has a feeling her mothers would disapprove, and knowing Walter isn’t favoring them makes it easier for her to gently decline.]

Is there another classic?