You'd have to ask Nature. It is not an invention of man. Spinach is a plant that human beings found edible and harmless. It turns out to be good for you, too.
The Tagalog word for spinach is "espinaka" or "alugbati".
Spinach
Spinach a vegetable.vegetable
Is spinach eaten by Sandra? No, spinach is eaten by Popeye.
Spinach is a plant. So they do have chloroplasts
bhaghi IS spinach
No, spinach is an herb.
The pigments of Malabar spinach are purplish while those of regular spinach are entirely green.
no, spinach is a vegetable.
The spinach family
I need several similes for spinach
The spinach was as green as a forest