Question

what do the trade winds and fat worms symbolise in the poetry I know why the caged birds sing by Maya angelou

Answer 1

Fat worms denotes the quality and quantity of the resources available for the whites or the free bird. Bright lawn shows us his freedom to go anywhere and have anything to do.

Answer 2

The line occurs in the fourth stanza of Angelou’s poem “I Know Why The Caged Bird Sings” where she compares the situations of a caged bird with that of a free bird.
 
In the above quoted line, fat worms waiting on a bright lawn means that opportunities are always present at the hands of the free bird. He even doesn’t have to find foods here and there. He gets anything and everything at will. 
 
This is to indicate the privilege that the white people of America enjoyed over the African Americans who used to lead their life like the caged bird in the poem.

Fat worms denotes the quality and quantity of the resources available for the whites or the free bird. Bright lawn shows us his freedom to go anywhere and have anything to do.