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Optimum germination of fringed sagebrush (Artemisia frigida Willd.) occurred at alternating temperatures of 10 to 20 C. Seeds were able to germinate (15%) in NaCl concentrations of 5000 ppmw. Light was important in seed germination; however, its absence could be overcome by adding 30 ppmw GA₃ (gibberellic acid) to the germination medium. Optimum pH for germination was between 5.8 and 7.0. Depth of planting influenced seedling emergence; the greatest emergence occurred when seeds were planted on the soil surface; emergence was lower when seeds were buried at any depth in the soil. Osmotic potentials of -13 bars and greater reduced germination, but 6% of the seeds germinated at -15 bars. Fringed sagebrush seedlings tolerated average plant water potentials of -10 to -19 bars and died when water potentials were decreased to -22 bars. Mature fringed sagebrush plants were capable of producing from 16500 to 190000 seeds/plant.
Weed Science © 1982 Weed Science Society of America