These are my first impressions after reading Grass by Sheri S. Tepper (1989) in March 2010.
It is a trope in science fiction to have far-future humans colonize alien worlds and then cut ties with Earth. This enables the story to be told on an alien planet but with familiar, human characters. Here, the planet is Grass, which is covered entirely with grass and peopled by two groups of humans: the aristocracy, who live on estancias out in the grass and do little but participate in mysterious, dangerous Hunts; and the working classes, who live in the planet’s only town and spaceport, where they are protected by the swamp forest that surrounds the town. To this world come an ambassador family from Earth, on a secret mission to find the cure to a plague that threatens all of humanity, which sets the plot in motion.
Tepper has built an intriguing, complex, and sinister world in Grass, and a lot of the suspense of the novel is in learning about the planet’s native species and discovering the true nature of the Hunts. But some of the secrets, when revealed, strained my disbelief. All in all, this is an entertaining (if long) story, a worthwhile reading that could probably have used a little more editing and focus.
Grass was nominated for both the Hugo and Locus awards in 1990. In 2002 it was included in the SF Masterworks collection. It is the first novel in the Arbai trilogy.