Osthmir tuber

Osthmir tubers are edible roots on Harmonthep.

They grew in brackish water.

Behind the scenes
The narrative of the Butlerian Jihad mentions that Ishmael dug osthmir tubers on Harmonthep, however the glossary of the book mentions they grew on Poritrin.

Appearances

 * Dune: The Butlerian Jihad