These days most people prefer to use watercolor for a Zen-like impression of the moment. A roughly textured cold pressed watercolor paper is usually selected for this purpose.
However, the medium of watercolor can also be used to create a slowly developed, detailed color study through the manipulation of subtle washes. I find hot pressed watercolor paper is more advantageous for this (what I call British) approach.
On site watercolors can clarify and illuminate the color relationships of a landscape. Some of the color studies here have played an essential role in the later development of an oil.