Question

Read the following excerpts:

Excerpt from My Antonia, by Willa Cather

Sometimes I went south to visit our German neighbors and to admire their catalpa grove, or to see the big elm tree that grew up out of a deep crack in the earth and had a hawk's nest in its branches.

Excerpt from Adventures of Huckleberry Finn, by Mark Twain

North of the house, inside the ploughed fire-breaks, grew a thick-set strip of box-elder trees, low and bushy, their leaves already turning yellow…

What might be the shared theme of these excerpts?