Chaenactis (douglasii)
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Ann DeBolt and Hilary Parkinson USDA FS - Rocky Mountain Research Station 316 E. Myrtle Boise, Idaho 83702 208-373-4366 208-373-4391 (fax) adebolt@fs.fed.us www.fs.fed.us/rm/boise |
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| Family Scientific Name: | Asteraceae | ||
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| Family Common Name: | Sunflower family | ||
| Scientific Name: | Chaenactis douglasii (Hook.) H. & A. | ||
| Common Name: | Douglas false-yarrow, Dusty maiden | ||
| Ecotype: | Wyoming sagebrush habitat, Owyhee County, ID, 1615 m | ||
| General Distribution: | Widespread, occurring in all western states, including North and South Dakota. Four varieties have been described. | ||
| Propagation Goal: | plants | ||
| Propagation Method: | seed | ||
| ProductType: | Container (plug) | ||
| Time To Grow: | 0 | ||
| Propagule Collection: | The creamy white flowers bloom from April to July. Phenology varies based on elevation, aspect and seasonal weather patterns. When mature, the composite head is similar to that of a dandelion in appearance. The brown achenes have relatively uniform maturation, typically 4-5 weeks after flowering. They have a fluffy pappus that is not removed during collection. Seed is easily dispersed by the wind, and can be hand stripped into containers. When collected at the appropriate time, it comes off the plant easily and requires minimal cleaning. After collecting and drying, seed was placed in a freezer for 48 hours to remove insect pests. It was then stored uncleaned in an unheated warehouse for one year prior to propagation trials. | ||
| Propagule Processing: | The seed was cleaned by hand. There are approximately 450,000 seeds/lb. | ||
| Pre-Planting Treatments: | One hundred seeds were placed in each of two clear plastic germination boxes on two layers of blotter paper and placed in cold stratification at 4§C for 30 days. The trays were then moved to a germination chamber set at 22§C with a 12 hour light/dark regime. Moistened tissue was placed over the seeds as the stiff pappus prevented the seeds from directly touching the blotter paper, potentially reducing their ability to imbibe water. A Thiram (fungicide) solution was applied to the seeds after three days of incubation to reduce fungal growth. Seeds germinated over the course of 6 days. Final germination was 12%. Additional work is necessary to determine if the low germination reflected low seed viability (no TZ tests were conducted), seed dormancy, or other factors. | ||
| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Upon first signs of germination, seeds were sown in styrofoam conetainers filled with a 50% peat and 50% vermiculite mixture. Containers were watered from an automatic overhead irrigation system which turns on when soil saturation levels fall below 80%, and turns off when soil reaches 100% fieldcapacity. Greenhouse temperature was set at a constant 27§C. Small amounts of fertilizer suitable for seedlings were added periodically. | ||
| Establishment Phase: | Of the 24 that germinated, 14 were healthy enough to transplant to the greenhouse. About one-third of the germinants planted in containers developed into healthy seedlings. | ||
| Other Comments: |
Partial funding for this research was provided by the USDI Bureau of Land Management, Great Basin Restoration Initiative. The use of trade or firm names in this publication is for reader information and does not imply endorsement by the U.S. Department of Agriculture of any product or service. This publication reports research involving pesticides. It does not contain recommendations for their use, nor does it imply the uses discussed here have been registered. All uses or pesticides must be registered by appropriate State and/or Federal agencies before they can be recommended. CAUTION: Pesticides can be injurious to humans, domestic animals, desirable plants, fish or other wildlife-if they are not handled or applied properly. Use all pesticides selectively and carefully. Follow recommended practices for the disposal of surplus pesticides and pesticide containers. |
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| References: | USDA, NRCS. 2004. The PLANTS Database, Version 3.5 (http://plants.usda.gov). | ||
Citation:
Parkinson, Hilary; DeBolt, Ann. 2005. Propagation protocol for production of Container (plug) Chaenactis douglasii (Hook.) H. & A. plants USDA FS - Rocky Mountain Research Station Boise, Idaho. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2024/07/22). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
