trefle.io · Taken Jul 18, 2022 by ray bee (cc-by-sa)
Malvaceae
Wild hollyhock
Iliamna rivularis
Also known as Malva rivularis, Streambank globemallow, Sphaeralcea rivularis var. diversa, Phymosia rivularis
Flowering Plants · Native Plants · Native · Pink Flowers · Hummingbird Plant · Pollinator · Tall Perennial · Moist Soil · Wildflower · Malvaceae · Western Us · Streamside
Wild hollyhock is a striking native perennial producing tall spikes of pale pink to lavender flowers that attract hummingbirds and pollinators throughout summer. It prefers moist, well-drained soil along stream banks or in woodland garden settings with partial shade, and benefits from regular watering during dry spells. Cut back spent flower stalks after blooming to encourage a tidy appearance and potential reblooming.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water thoroughly; keep soil consistently moist, especially in summer heat · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 6–8.5
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed, Division, Cutting
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 4 ft
- Spacing
- 36 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Alberta, British Columbia, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming
- Attracts
- Bees, Butterflies, Hummingbirds
Sources: trefle, usda
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