Philadelphus (lewisii)

Tara Luna USDI NPS - Glacier National Park West Glacier, Montana 59936 (406) 888-7835 http://plant-materials.nrcs.usda.gov/azpmc

---

Family Scientific Name:	Hydrangeaceae
Family Common Name:	Hydrangea family
Scientific Name:	Philadelphus lewisii Pursh
Common Name:	Lewis' Mock Orange
Species Code:	PHILEW
Ecotype:	Flathead Lake, Flathead County, MT.
General Distribution:	P. lewisii is found on open, rocky slopes from low to mid elevations; from British Columbia and Alberta south to Idaho, Montana, and California. It is found from sea level to 2500 meters elevation.
Propagation Goal:	plants
Propagation Method:	seed
ProductType:	Container (plug)
Stock Type:	172 ml conetainer
Time To Grow:	18 Months
Target Specifications:	Stock Type: Container seedling<br> Height: 15 to 20 cm<br> Caliper: N/A<br> Root System: Firm plug in container.
Propagule Collection:	Collect capsules in late summer when they turn brown and begin to dehisce. Seeds are light tan at maturity. Seeds are collected in paper bags and kept in a well ventilated drying shed prior to cleaning.
Propagule Processing:	Seeds are cleaned by rubbing capsules against screens. Seed longevity: is unknown. Seed dormancy is classified as physiological dormancy. Seeds/kg: 7,716,000/kg % Purity: 100% % Germination: 50 to 60% estimated.
Pre-Planting Treatments:	5 month outdoor cold moist stratification. Stratification for a minimum of 8 weeks is recommended.
Growing Area Preparation/ Annual Practices for Perennial Crops:	Outdoor nursery growing facility. Sowing Method: Direct Seeding. Seeds are lightly covered with media. Growing media used is 70% 6:1:1 milled sphagnum peat, perlite, and vermiculite and 30% sand with Osmocote controlled release fertilizer (13N:13P2O5:13K2O; 8 to 9 month release rate at 21C) and Micromax fertilizer (12%S, 0.1%B, 0.5%Cu, 12%Fe, 2.5%Mn, 0.05%Mo, 1%Zn) at the rate of 1 gram of Osmocote and 0.20 gram of Micromax per 172 ml conetainer. Conetainers are sown in late fall and irrigated thoroughly prior to winter stratification.
Establishment Phase:	Seeds germinate in the outdoor nursery in late spring when temperature reach 21C during the day. Germination to true leaf stage is 2 weeks. Seedlings are thinned and transplanted at this stage.
Length of Establishment Phase:	4 weeks
Active Growth Phase:	Growth is rapid follwing establishment. Seedlings are fertilized with 20-20-20 liquid NPK at 100 ppm once a week during the active growth stage. Seedlings reach root tightness in conetainers in 8 weeks and can be uppotted to 800 ml containers.
Length of Active Growth Phase:	8 weeks
Hardening Phase:	Seedlings are fertilized with 10-20-20- NPK liquid fertilizer during September. Irrigation is gradually reduced through the fall months.
Length of Hardening Phase:	4 weeks
Harvesting, Storage and Shipping:	Total Time To Harvest: 1.5 years for 800 ml container stock. Harvest Date: June or July Storage Conditions: Overwinter in the outdoor nursery under insulating foam cover and snow.
Length of Storage:	5 months
Other Comments:	P. lewisii is also propagated by cuttings.
References:	Flora of the Pacific Northwest, Hitchcock and Cronquist, University of Washington Press, 7th printing, 1990. Seeds of the Woody Plants in North America, Young and Young, Dioscorides Press, 1992. The Reference Manual of Woody Plant Propagation: From Seed to Tissue Culture, Dirr and Heuser, Varsity Press, 1987. Glacier National Park Propagation records, unpublished.

Citation:

Wick, Dale. 2001. Propagation protocol for production of Container (plug) Philadelphus lewisii Pursh plants 172 ml conetainer; USDI NPS - Glacier National Park West Glacier, Montana. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2024/07/02). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.