Thank you, Aoyama-san!!
That's what I was thinking about, but it doesn't make sense for me... I mean, this way the sentence has a meaning, but I don't know how this exactly fits with the rest of the context... She's describing a house and its garden, and can't see the importance of those leaves having a sharp edge... Just out of curiosity... Could it be (I'm just inventing now) this a kind of explanation to describe medicinal herbs, for example? Or would this be totally impossible?
I'm sorry for being so nosy...