rockm

For what it's worth, a ledge underneath a window outside probably isn't a terrific place for a plant in the wintertime. Temperatures would tend to vary pretty widely and would tend to the extremes--too hot in the daytime, followed by a complete collapse of temps at night. This would happen since the plant is exposed on all sides by air and is offered little protection by anything of size and mass. The ground is a better place for overwintering, as it tends to stay "warm" for longer. It is alot more stable temperature wise than a ledge. Stable, constant temperature is what keeps bonsai healthy in overwintering. Extremes are to be avoided at all costs.

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