All of these plants are at least partially edible, with the exception of wolf's bane and lily of the valley, which are poisonous.

Asqo said:

All of these plants are at least partially edible, with the exception of wolf's bane and lily of the valley, which are poisonous.

That explains why Maomao wants to eat them.

Dancing_Menreiki said:

That explains why Maomao wants to eat them.

I rather think she's not interested in the edible part and just wants to enjoy the poison.