Kino warns Juana about poisonous plants. How does Juana react?

I see no obvious mention of poisonous plants in the text. I will need a chapter number for this question.

chapter 6 page 76

Juana smiles, as she already knows.

"Beware of that kind of tree there," he said, pointing. "Do not touch it, for if you do and then touch your eyes, it will blind you. And beware of the tree that bleeds. See, that one over there. For if you
break it the red blood will flow from it, and it is evil luck." And she nodded and smiled a little at him, for she knew these things.