Iliamna rivularis
Common Name(s):
Wild Hollyhock
Streambank Hollyhock
Synonym:
Sphaeralcea riivularis
Mountain Globemallow
Flower:
Pink
Blooms :
Jun
to:
Aug
Five egg-shaped, pinkish petaled flowers in racemes.
Botanical Description
Fragrant?
NO
Family:
Malvaceae
Herbaceous Plant, Perennial
Foliage:
Green
Leaves maple-like with star shaped hairs
Fall Color?
YES
Foliage fades to a subtle pale yellow to light brown before dropping and going into dormancy
Deciduous
Photo by:
Heading 6
Oregon Native?
YES
West State Native?
YES
Origins:
Native to western North America
Site Selection
Minimum USDA Hardiness Zone:
3
Water Needs:
M
Sun Needs:
Partial Sun
Deer Resistant?
NO
Firewise?
YES
Height:
4-6'
Spread:
2-3'
Growth Rate:
Medium
Native Habitat:
Moist well-drained streambanks, high elevation meadows, open forested edges
Soil:
Moist sandy/loam
Care Recommendations
Maintenance Level:
Low
Fertilizer:
A light feeding of a balanced slow-release 5-5-5 in early spring
Mulch:
Untreated wood chips, shredded leaves, pine straw
Watch to be sure plant gets enough water during hot periods, full sun, moist well-drained soil
Long Term:
Winter:
Cut dead stems if not done in fall, mulch, give occassional watering until soil freezes can reseed late fall early winter
Spring:
Cut back old dead stalks, apply 1-2" layer of compost, or a light balanced slow-release fertilizer, well-drained soil, full sun
Summer:
Give regular weekly watering, use a biweekly liquid feed during new growth, mulch
Fall:
Cut stems down to a few inches above the soil, discard or burn foliage, mulch
General Care Comments:
Pest resistance, hardiness, importance to pollinators
Common Problems
Long term fire suppression means no germinating seeds, competition from invasive species
Diseases:
Hollyhock rust, powdery mildew, anthracnose
Insects:
Hollyhock weevil, butterfly larvae, aphids, spider mites
Environmental Problems:
Fire suppression, shading by taller vegetation, heavy grazing
Pests:
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