Because plants are generally so abundant, we take them for granted. We do not value the familiar. Yet plants contribute to all our food, to fuel, to shelter, to various useful chemicals, including medicinal drugs.
Janick et al. make the following statements:
The story of our species is largely a chronicle of struggle for dominion over the environment... To a great extent, controlling the environment means controlling plant life.[I would add that 'controlled', 'managed', or 'dominated' plants = crop plants. These include food crops, spices, as well as the hundreds of ornamental plants.]
It is beyond question that one of the salient characteristics of American wealth is the abundance and low-cost of food. All of the industrialized countries have a strong foundation in efficient agricultural production.