To plant something is to put it into a place where it can grow. When used as a verb, "plant" is often associated with flowers, trees, shrubs, and grass:
We’re planting tomatoes in our garden.
Last year we planted asparagus.
My neighbor is planting a tree in his front yard.
What kinds of things do you like to plant?
He planted a tree.
You can also use "plant" as a verb for other activities:
The professor planted some new ideas in the minds of his students.
The defense attorney planted seeds of doubt among the jurors deciding the defendants’s fate.
Plant your foot before you throw the ball.
U.S. astronauts planted an American flag on the moon when they visited in the 1960s.
The word "plant" is also a noun:
Alonso and Marguerita bought some plants for their garden.
A nice house plant can add fresh oxygen inside your home.
A new automobile assembly plant was built recently in Tennessee. (plant = factory)
Workers protesting outside of the plant are asking for increased wages and better working conditions.
He planted a tree.