The Greek that is translated in English as “mustard seed” is translated in Muna as “wonolita seed.” René van den Berg explains: “The mustard plant rarely exceeds 50 cm in height. A wonolita is a big forest tree growing from a tiny seed.”

In the Bislama and Uripiv translations it is translated as “banyan.” “The banyan tree is one of the biggest in the islands, and it grows from a tiny seed. We (Uripiv) added a footnote to explain to more advanced readers what we had done: ‘Here Matthew compares the kingdom of God to a mustard seed, but since mustard doesn’t grow here, we put banyan, so that Matthew’s meaning will be clear.’” (Source: Ross McKerras)

In Elhomwe it is translated as “tree seed.” (Source: project-specific translation notes in Paratext)

In Gbaya is is translated with the ideophone kɛ̧́ɛ̧́ which “denotes a very tiny and barely visible object. (…) The Gbaya team applied it to faith instead of referring to a mustard seed which is unknown to Gbaya readers.” Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)

See also mustard.