Noun
food plant (plural food plants)
(chiefly entomology) A plant which is a source of food for a given species.
Algae is the perfect food plant. It doubles cell mass every twelve hours, depending on the strain. Homaro Cantu
From the distribution of wild food plant remains found at Abu Hureyra it seems that they lived there year round. Source: Internet
It is also an important caterpillar food plant for large and common blue butterflies. Source: Internet