Created 26-Jan-18
Modified 26-Jan-18
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Geranium robertianum

Herb Robert

New Zealand Status: Introduced
Conservation Status: Naturalised

Geranium robertianum, a member of the wild Geranium family, is an annual or biennial herb that grows with a sprawling habit to a height of about 400mm. Stems are many-branched, often redish, and hairy. The fern-like, light green leaves form a basal rosette and are opposite on stems. The leaf blade is triangular, about 100mm long, with three, sometimes five, deeply lobed leaflets. Lobes are narrow with sharp tips. Leaves become red at the end of the flowering season.

Flowering occurs from spring to early autumn. Flowers are pink, 8-15mm across, with five round tipped petals, ten stamens, five carpels and five sepals with long hairs and broadly membranous margins. Flowers are usually auxiliary in pairs or terminating stems.

Geranium robertianum is shade tolerant and grows on a wide range of soil types, except those that are strongly acidic. It's habitats include disrurbed and waste land, forest margins, rocky banks, screes and coastal shingle from sea-level to about 700m altitude.
Geranium robertianum, Herb Robert FlowerGeranium robertianum, Maturing Seed Capsules