Grindelia (squarrosa)
|
Tara Luna USDI NPS - Glacier National Park West Glacier, Montana 59936 (406) 888-7835 http://plant-materials.nrcs.usda.gov/azpmc |
|
| Family Scientific Name: | Asteraceae | ||
|---|---|---|---|
| Family Common Name: | Sunflower Family | ||
| Scientific Name: | Grindelia squarrosa (Pursh) Dunal. | ||
| Common Synonym: | Grindelia perennis Nels. | ||
| Common Name: | Curlycup gumweed | ||
| Species Code: | GRISQUA | ||
| Ecotype: | Waterton Lakes National Park, Alberta | ||
| General Distribution: | Grindelia squarrosa ranges from British Columbia to Manitoba south to California, Texas and Missouri. It is found in vernally moist soil around prairie wetlands, roadsides and other disturbed ground. | ||
| Propagation Goal: | plants | ||
| Propagation Method: | seed | ||
| ProductType: | Container (plug) | ||
| Stock Type: | 160 ml container | ||
| Time To Grow: | 7 Months | ||
| Target Specifications: | Height: 7 cm, 4 to 6 true leaves Caliper: n/a Root System: Firm plug in 160 ml container | ||
| Propagule Collection: | Seeds are collected in late August to late September. Seeds are collected when achenes are easily separated from receptacle. Seeds are grey at maturity. Seeds are collected in paper bags and kept in a well ventilated drying shed prior to cleaning. | ||
| Propagule Processing: |
Small seedlots are hand cleaned with screeens to remove chaff. Seed longevity: N/A Seed dormancy is classified as non-deep physiological dormancy. Seeds/Kg: % Germination: 50% |
||
| Pre-Planting Treatments: | 60 day cold, moist stratification. Seeds are imbibed in water for 4 hours and placed in fine mesh bags buried in moist peat moss in ventilated containers under refrigeration at 1 to 3C. | ||
| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Propagation Environment: Greenhouse 23C day /15C night temperatures. Sowing Method: Direct Seeding. Seeds are lightly covered with medium. Growing medium used 6:1:1 sphagnum peat, vermiculite and perlite 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 irrigated thoroughly after sowing. |
||
| Establishment Phase: | Medium is kept slightly moist during germination by misting twice per day. True leaves emerge 2 weeks after initial germination and seedlings are thinned at this stage. | ||
| Length of Establishment Phase: | 4 to 6 weeks | ||
| Active Growth Phase: | Once seedlings are established, plants develop rapid shoot and root growth 2 to 4 weeks following germination. Plants are fertilized with 20-20-20 liquid NPK at 100 ppm weekly during the growing season. | ||
| Length of Active Growth Phase: | 12 weeks | ||
| Hardening Phase: | Plants are fertilized with 10-20-20 liquid NPK at 200 ppm in early fall. Containers are leached with water. Irrigation is gradually reduced through September and October. | ||
| Length of Hardening Phase: | 4 weeks | ||
| Harvesting, Storage and Shipping: |
Total Time To Harvest:7 months Harvest Date: September Storage Conditions: Overwinter in outdoor nursery under insulating foam cover and snow. |
||
| Length of Storage: | 5 months | ||
| References: | Flora of the Pacific Northwest, Hitchcock and Cronquist, Univ. of Washington Press, 7th printing, 1990. | ||
Citation:
Luna, Tara. 2008. Propagation protocol for production of Container (plug) Grindelia squarrosa (Pursh) Dunal. plants 160 ml container; USDI NPS - Glacier National Park West Glacier, Montana. 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.
