JUDY WOODRUFF:

Now the conclusion to our series on Cuba.

All week long, we have showed you ways in which that country is dealing with significant shifts in business, arts, culture, and society.

Tonight, Jeffrey Brown reports about an industry where Cuba has been a leader, organic farming. Its growth was born out of necessity. But now its approach is attracting attention in the U.S. and other places. It's part of our stories on The Cuban Evolution.