Bananas ripe and green, and ginger-root,
Cocoa in pods and alligator pears,
And tangerines and mangoes and grape fruit,
Fit for the highest prize at parish fairs.
Set in the window, bringing memories
Of fruit-trees laden by low-singing rills,
And dewy dawns, and mystical blue skies
In benediction over nun-like hills.
My eyes grew dim, and I could no more gaze;
A wave of longing through my body swept,
And, hungry for the old, familiar ways,
The scenery and  further imagery  is making the narrator reminisce about the nostalgia of his past. The  tropics of his hometown  and memories of his previous times are lacking in his new life. 
 The mentioning of benediction not only shows his religious roots, but also how these times should be highly valued and praised with high regard. 

Tropics in New York