Alphabetical Plant Listing

Iliamna rivularis (Wild Hollyhock)

Streambank Wild Hollyhock, Wild Hollyhock, Mountain Globemallow


Iliamna rivularis (Wild Hollyhock) is a perennial wildflower boasting showy terminal racemes of pink, rose-purple or nearly white flowers, 2-3 in. wide (5-7 cm), over a long season. Blooming in early to late summer, they are borne from the upper leaf axils on stout stalks. The foliage of large leaves is broadly heart-shaped with triangular lobes. Wild Hollyhock reproduces by seed and is not rhizomatous. The seeds have a smooth, hard coat and require a heat treatment for germination. They remain viable for at least a few hundred years! Wild Hollyhock occurs on mesic sites in deep, moist, but well-drained soil. It commonly grows on forested slopes, in meadows, along streambanks, and in disturbed areas. It flowers profusely after a disturbance such as a wildfire but is quickly replaced by other vegetation. Wild Hollyhock can be used in beds and borders as well as informal sites such as prairies and meadows.

  • Grows up to 3-6 feet tall (90-180 cm) and 2-3 ft. wide (60-90 cm).
  • Thrives in rich, moist, well-drained soils in full sun. Wild Hollyhock is shade-intolerant.
  • No serious pest or disease issues.
  • Native to western North America.

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Requirements

Hardiness 3 – 8
Plant Type Perennials
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Height 3' – 6' (90cm – 180cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 36" (90cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Showy
Native Plants United States, Midwest, Illinois, Indiana, Pacific Northwest, Idaho, Oregon, Washington, Rocky Mountains, Colorado, Montana, Utah, Wyoming, Southeast, Virginia, Southwest, Nevada
Garden Styles Informal and Cottage, Prairie and Meadow

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By Emily Marie Wilson, Shutterstock, Gertjan van Noord, Flickr

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 8
Plant Type Perennials
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Height 3' – 6' (90cm – 180cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 36" (90cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Showy
Native Plants United States, Midwest, Illinois, Indiana, Pacific Northwest, Idaho, Oregon, Washington, Rocky Mountains, Colorado, Montana, Utah, Wyoming, Southeast, Virginia, Southwest, Nevada
Garden Styles Informal and Cottage, Prairie and Meadow

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