Yoshi was the largely unseen gardener of Niles and Maris Crane. He likes to create elaborate garden hedges. He frequently feuds with the Cranes over the zen garden he wishes to add, and eventually does. He is mentioned in many episodes by Niles, only once briefly seen. He died during "The Fight Before Christmas" from a heart attack while trimming Maris's hedge maze. Niles said "the paramedics never had a chance" given the extent of the shrubbery.
Niles first mentioned Yoshi as he ordered coffee at Café Nervosa in the pilot.