See his Five Plays of the South (1963); study by B. H. Clark (1974).
Green's tragedy of the decline of an old Southern family, The House of Connelly was chosen by the newly formed Group Theatre for its inaugural production. Often compared to Anton Chekhov's The Cherry Orchard in its contrast of aristocratic decay and parvenu energy, The House of Connelly was praised by critic Joseph Wood Krutch as Green's finest play to date.
But Green had already begun to move away from the realistic style of his early work. In 1928-29 he traveled to Europe on a Guggenheim Fellowship and was impressed by the non-realistic productions that he saw there. He began to experiment with expressionism and the Epic theatre of Bertolt Brecht and Erwin Piscator. In the 1930s Green largely abandoned the New York theatre, whose commercialism he found distasteful. His experiments in non-realistic drama, Tread the Green Grass (1932) and Shroud My Body Down (1934) both premiered in Chapel Hill, and never were professionally produced in New York.
In 1936, Green returned to the Group Theatre with his pacifist musical play, Johnny Johnson, with a score by Kurt Weill. In it, Green experimented with genre, writing the first act as a comedy, the second as a tragedy, and the third as a satire. The production encountered problems of style early on: set designer Donald Oenslager designed the first act in poetic realism, the second in expressionism, and the final act in an extremely distorted style, director Lee Strasberg wanted to stage it realistically, and others in the company wanted it to be staged expressionistically throughout. Reviews ranged from the enthusiastic to the dismissive, and it ran for sixty-eight performances.
Green created a new dramatic form that he called symphonic drama. Inspired by historical events, it incorporated music and pageantry, usually for outdoor performance. His first experiment in this form was Roll Sweet Chariot, (1934), which ran for a scant four performances on Broadway. Much more warmly received was the first and most famous of his outdoor symphonic dramas, The Lost Colony (1937) which is still played during the summer in an outdoor theater at Fort Raleigh National Historic Site near Manteo, North Carolina. The Lost Colony is the second oldest outdoor historical drama in the United States. Among Green's other outdoor symphonic dramas are Faith of Our Fathers, Wilderness Road, The Founders, Trumpet in the Land, which tells the story of the American massacre of Native American Moravians in Gnadenhutten, Ohio, during the American Revolution, and The Stephen Foster Story which continues to be played each summer in Bardstown, Kentucky. The little one room house where he did much of his writing can be seen at the North Carolina Botanical Gardens in Chapel Hill, North Carolina.