• Olympic: Three Parks in One

    Olympic

    National Park Washington

Herb Robert

Herb Robert

Herb Robert has five-petaled flowers and reddish stems.

NPS Exotic Plant Management Team

Geranium robertianum

This low-growing geranium species is also called “stinky Bob” for its unmistakeable and unpleasant smell.

Identification:

Herb Robert is a low-growing (up to ten inches high), herbaceous species. The stems are often dark red and covered with white hairs. Its leaves are made up of three to five leaflets that are long-stemmed and deeply dissected. Flowers are purple, pink, or white with five petals and found from early spring to fall.

How is it spreading and where?

Herb Robert was introduced from Eurasia and northern Africa. It easily spreads into undisturbed areas and is shade tolerant. It spreads by seeds that are sticky and are launched explosively.

In Olympic National Park, it has spread and established itself in several lowland areas.

 
Herb Robert

Herb Robert's dissected leaves
have a feathery look.

NPS Exotic Plant Management Team

Control in Olympic:

Herb Robert is hand-pulled and dug out for smaller populations.

For more information, see Weed Resources.

Back to Invasive Plants

Did You Know?