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The Forest Service National Center for Reforestation, Nurseries, and Genetic Resources (RNGR) is a leading source of technical information for nurseries and land managers regarding production and planting of trees and other native plants for reforestation, restoration, and conservation.

 
NPN Protocol Details Image

Hierochloe (odorata)

John P. Morgan
President
Rancho Santa Ana Botanic Garden
PO Box 10, 0043E - 82nd Road N
Argyle, Manitoba R0C0B0
204-467-9371
john01@xplornet.com
www.rsabg.org

Family Scientific Name: Graminae
Family Common Name: Grasses
Scientific Name: Hierochloe odorata
Common Name: Sweet Grass
Ecotype: Local Manitoba
General Distribution: Central & northern North America
Known Invasiveness: Can spread by rhizomes in seasonally moist areas, rarely by seed
Propagation Goal: seeds
Propagation Method: seed
ProductType: Container (plug)
Stock Type: Local
Time To Grow: 3 Months
Target Specifications: To grow transplantable seedlings that will survive on their own
Propagule Collection: Seed should be collected fresh in June & early July
Propagule Processing: None if planted immediately, drying if stored
Pre-Planting Treatments: None for fresh seed;
Cold moist stratification at 4 degrees C, 40 degrees F, for dried seed for 8 weeks
Growing Area Preparation/
Annual Practices for Perennial Crops:
Clean weed free planting area, moist
Establishment Phase: Same
Length of Establishment Phase: 1-2 growing seasons
Active Growth Phase: Long-lived perennial
Length of Active Growth Phase: Unknown - many years
Hardening Phase: 1 week if placing out from greenhouse propagation - gradually expose to increasing sun & wind, decreasing moisture
Length of Hardening Phase: 1 week
Harvesting, Storage and Shipping: Seed to be harvested late June - early July in Manitoba latitude 50 degrees
Length of Storage: Can be stored cool & dry for ~ 2-4 years without too much loss of viability
Other Comments: Easy to grow from root cuttings & offshoots from parent plants; very fragrant; native peoples consider this grass to have been the first species to cover the earth & a good purifier; seed & mature plants very difficult to find after mid summer as other grasses & forbs often get taller & hide it
References: 20+ years greenhouse experience with this species in Manitoba, Canada

Citation:

Morgan, John P.. 2010. Propagation protocol for production of Container (plug) Hierochloe odorata seeds Local; Rancho Santa Ana Botanic Garden Argyle, Manitoba. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/06/08). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.