Geranium nodosum, the knotted crane's-bill,[2] is a perennial herbaceous plant in the family Geraniaceae.

Geranium nodosum is a rhizomatous geophyte, a plant that propagates by means of a rhizome, a reproductive structure in the form of a horizontal stem which produces the stem and the roots below the soil surface.

During the winter the plant has no aboveground herbage, having become reduced to the rhizome.

The typical habitat of this species is the margins of deciduous forest among oak, beech, and chestnut.

It grows on calcareous and siliceous substrates with neutral pH and average soil moisture.