We started by each granddaughter sketching her suggestion for filling the bottom right corner of the layout, then we combined the two ideas on one of the sketches as the final design:
Then we used Lou Sassi's recipe for ground goop that we had used before: one cup each of earth-tone paint, celluclay, and vermiculite along with 1/2 cup of white glue. The girls spread this over the corner:
Then they added some grey-brown dirt picked up from the yard for the "main" road plus a little tan gravel for the path to the tobacco barn. The path needs a little work since the gravel was a bit coarse!
Oh, and, yes, we did install the tobacco plants -- while the ground goop was still damp -- in rows about 4-5' apart, and the plants maybe 4' apart.
Another nice job by the girls. Maybe not my exact plans, but certainly fills the bill.