Iris (innominata)

Lee Riley Horticulturist USDA FS - Dorena Genetic Resource Center 34963 Shoreview Road Cottage Grove, Oregon 97424 541-915-7324 541-767-5709 (fax) lee.riley@usda.gov

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Family Scientific Name:	Iridaceae
Family Common Name:	Iris
Scientific Name:	Iris innominata
Common Name:	Del Norte County iris
Species Code:	IRIN
Ecotype:	Rogue River-Siskiyou National Forest, Oregon
General Distribution:	Oregon, California
Propagation Goal:	Plants
Propagation Method:	Seed
ProductType:	Container (plug)
Stock Type:	262 ml (16 in3) container
Time To Grow:	25 to 26 weeks
Target Specifications:	Stock Type: Container seedling Root System: Firm plug in container.
Propagule Collection:	Easily collected from the large capsules
Pre-Planting Treatments:	Seeds are placed into fine mesh bags and soaked in a 1% hydrogen peroxide (3:1 water/3% hydrogen peroxide) 24 hours, rinsed, and placed in water for an additional 48 hours. Seeds are placed in a sealed container and into warm stratification (10 °C) for 14 days. Following warm stratification, seeds are placed into cold stratification (1 to 3 °C) for an additional 14 days. It is very important to check seeds in warm and cold strat weekly. If mold is evident, seeds should be treated with 1% hydrogen peroxide.
Growing Area Preparation/ Annual Practices for Perennial Crops:	Greenhouse growing facility. Seeds are directly sown into containers. Seeds are lightly covered with nursery grit. Growing medium used is 40:20:20:20 peat:composted fir bark:perlite:pumice with Nutricote controlled release fertilizer (18N:6P2O5:8K2O with minors; 180-d release rate at 21C) at the rate of 1.5 gram Nutricote per 262 ml container.
Establishment Phase:	Germination is uniform but somewhat slow. It may take up to 3 weeks for seeds to germinate. Following germination, plants are fertilized with soluble 12-2-14-6Ca-3Mg at 75 ppm for 1 week.
Length of Establishment Phase:	4 weeks
Active Growth Phase:	Seedlings grow somewhat slowly throughout the active growth phase. If sown in late winter/early spring, however, there is no problem to fill the container. During the growing season, fertilization depends on weather. Soluble 20-9-20 NPK, 20-18-18 NPK, or 17-5-24 NPK at a rate of 100 ppm is applied weekly throughout the growing season.
Length of Active Growth Phase:	20 weeks
Hardening Phase:	No dry-down is done to induce dormancy. Seedlings are moved to an outdoor growing area in early to mid September.
Length of Hardening Phase:	2 weeks
Harvesting, Storage and Shipping:	Harvest Date: Mid to late October Storage Conditions: Seedlings are usually outplanted in fall. No storage except in outdoor growing area. Plants are well irrigated prior to shipping and shipped in containers.
References:	Dorena Genetic Resource Center Propagation Records, unpublished. Lady Bird Johnson Wildflower Center. nd. Iris innominata L.F. Hend. Del Norte County iris. URL: https://www.wildflower.org/plants/result.php?id_plant=IRIN (accessed 11 Oct 2018). Painter E. 2016. Common (vernacular) names applied to California vascular plants. Berkeley (CA): University of California, The Jepson Online Interchange California Floristics. URL: http://ucjeps.berkeley.edu/cgi-bin/get_painter_common.pl?29284 (accessed 11 Oct 2018). USDA Natural Resources Conservation Service. Iris innominata L.F. Hend. Del Norte County iris. URL: https://plants.usda.gov/core/profile?symbol=IRIN (accessed 11 Oct 2018).

Citation:

Riley, Lee E.; Klocke, Allison. 2018. Propagation protocol for production of Container (plug) Iris innominata Plants 262 ml (16 in3) container; USDA FS - Dorena Genetic Resource Center Cottage Grove, Oregon. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/04/21). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.