Morris has published several volumes of poetry, and has edited the works of other Caribbean writers. His collections include The Pond (revised edition, New Beacon Books, 1997), Shadowboxing (New Beacon Books, 1979), Examination Centre (New Beacon Books, 1992) and On Holy Week (a sequence of poems for radio, Dangaroo Press, 1993). He also edited The Faber Book of Contemporary Caribbean Short Stories and published Is English We Speaking, and other essays. In 2006 Carcanet Press published his I been there, sort of: New and Selected Poems.
The best known poems by Morris include: "Little Boy Crying", "Family Pictures", "Love Is", "One, Two", "Home", "The Roaches", "The Pond" and "Critic".