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Romneya coulteri
Romneya coulteri

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Zone
Zones 4-12, 14-24, H1
Full Sun
Full
Regular WaterMinimal Water
Moderate, Minimal

Romneya coulteri

Matilija Poppy
Papaveraceae
Perennials, Shrubs

Native to the coastal mountains and valleys of Southern Cali­fornia and Baja California, this spectacular 6–8-ft. perennial is covered with 9-in., yellow-centered white flowers from late spring into summer. Sends up thick stems clothed in irregularly lobed, gray-green leaves and spreads by rhizomes. Each blossom has five or six crepe-papery petals centered with a cluster of golden stamens. ‘Butterfly’ is a profusely branching plant with smaller flowers of rounded, overlapping petals. ‘White Cloud’ is exceptionally vigorous, with profuse, very large blossoms.

Use on hillsides as soil binder, in marginal areas, or in wide borders. Invasive; don’t plant near less vigorous plants. Tolerates many types of soils. Withhold summer irrigation to keep growth in check. Cut nearly to ground in late fall. New shoots emerge after first rains in winter. Although easy to grow once established, the plant is very difficult to propagate. Easiest way to get more plants is to dig up rooted suckers from spreading roots. To help seeds germinate, mix them with potting soil in a foil-lined flat; burn pine needles on top of flat for 30 minutes, then water and hope for sprouting.

 

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