The biological form of Geranium sanguineum is hemicryptophyte, as its overwintering buds are situated just below the soil surface and the floral axis is more or less erect with a few leaves. It has a thick rhizome. The stems are prostrate to ascending, well developed, very branched and hairy. This plant reaches on average 30-50 centimetres (12-20 in) in height. The petiolate leaves have five lobes (or segments), each segment is tripartite in large teeth. The flowers have a diameter of 2.5 to 4 cm. and are purple The flowering period extends from May through October. The flowers are hermaphrodite and pollinated by insects (entomophily). The most common flower visitors are Syrphidae and Hymenoptera, but also butterflies and Coleoptera. The fruit is a schizocarp that breaks up into five mericarps when ripe.