A Japanese garden is a specific thing: a composition of water, stone and clipped planting, usually with a path that reveals it a section at a time. Japan has thousands, from the circuit gardens of the great daimyo to the moss gardens of a single temple. The ones below are covered in detail on this site, grouped by what kind of garden they are.

Garden paths and pines at Kenrokuen in Kanazawa, Ishikawa, Japan
Photo: 663highland · CC BY 2.5 · Wikimedia Commons

Daimyo circuit gardens

Large gardens built for a feudal lord, designed around a pond you walk around rather than look down on.

Temple and shrine gardens

Where the planting is part of a religious setting rather than a private pleasure ground.

Small and specialised

Single-purpose gardens, or a garden that is one stop inside a bigger day.

Gardens are seasonal in a way castles are not: the same garden is a different place in April, August and November. Every guide linked above covers the season question for that specific garden, because the answer is not the same everywhere.