Crocosmia x crocosmiiflora (montbretia)

Crocosmia x crocosmiiflora

Photo courtesy Joseph DiTomaso

Crocosmia x crocosmiiflora (crocosmia or montbretia) is a perennial (family Iridaceae) found along the coast of California and in the San Francsico Bay region. Crocosmia is a commonly cultivated ornamental plant, and is most commonly found near urban areas. It prefers disturbed areas, including roadsides, coastal scrub, prairie and forests. Crocosmia is a superior competitor for water, light and nutrients, and it excludes native plants by growing in dense patches. It reproduces using seeds and underground corms. Upon introduction to a new area, crocosmia spreads slowly at first, then more rapidly as the species becomes established.

Cal-IPC Inventory rating: Limited

Cal-IPC Resources on Crocosmia x crocosmiiflora

• California Invasive Plant Inventory Assessment Form (pdf) - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
• Cal-IPC News - Articles from our quarterly newsletter. Each issue is available as a pdf. (None for this species.)
• Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium. (None for this species.)
• Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.

Cal-IPC News Articles

• None for this species.

Cal-IPC Symposium Proceedings

• None for this species.

Other Resources on Crocosmia x crocosmiiflora

• Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from the UC Berkeley Jepson Herbarium.
• CalFlora - Distribution information by county based on submitted observations and herbarium specimens.
• Natural Resource Projects Inventory - State database with information on resource management projects throughout California. Query by the species of interest.

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