Species (common name, Latin name)
Streambank Hollyhock, Mountain Hollyhock, Streambank Globemallow; Iliamna rivularis
hollyhock occurs mostly east of the
hollyhock commonly grows on forested slopes, in meadows, along streambanks, and in disturbed areas It
occurs on mesic sites in deep, moist, but
well-drained soil. It has been found to 11,500 feet (3,490 m) elevation in
East side of cascades near foothills and forest openings around mid elevations (2)
Plant strategy type/successional stage
rivularis is an early seral species. It becomes abundant following disturbance such as clearcutting, broadcast burning, and wildfire. (1)
Other plants in the Hollyhock family.
May be collected as: (seed, layered, divisions, etc.)
Seeds are hand collected in late August when capsules turn brown and begin to dehisce. Mature seed color is brown. Seed capsules are collected in paper bags and kept in drying shed prior to cleaning. (3)
Seeds are scarified in a brief, 5 to 10 second hot water bath and immediatlely transferred to cold water and imbibe overnight.Seeds are placed in fine mesh bags in moist peat moss in ventilated containers at 3C for a 30 day cold moist stratification. (3)
Seed longevity is at least 10 years under dry cool storage conditions at and low relative humidity.(3) Wild hollyhock seeds remain viable for at least a few hundred years (1)
Dry cool storage conditions.
Seed seems to be the easiest way to propagate Hollyhocks.
Soil or medium requirements (inoculum necessary?)
It occurs on mesic sites in deep, moist, but well-drained soil. In greenhouse conditions growing media used is 70% 6:1:1 milled sphagnum peat, perlite, and vermiculite and 30% sand.
Installation form (form, potential for successful outcomes, cost)
Seeds do seem to be considered difficult to germinate.
Seedlings are uppotted into 1 gallon containers in late spring. Irrigate in morning until the pots are leached and irrigation is gradually reduced in September and October. Plants were given one final irrigation prior to winterization (3)
Total Time To Harvest: 7 months (3)
1. Matthews, Robin F. 1993. Iliamna rivularis. In: Fire Effects Information System,
3. Wick, Dale; Evans, Jeff; Luna,
Data compiled by (student name and date)