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  • Author or Editor: Bill Varga x
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University students have been involved with the Utah Botanical Gardens (UBG) since their inception in 1954 as part of the Utah State University (USU) Utah Agricultural Experiment Station (UAES). Students and professors travel from USU to visit UBG, conduct class tours, and participate in research projects. Students also work at UBG as summer interns, and in 1986, USU began offering off-campus horticulture classes for credit at UBG. Today, 20 different classes are taught at UBG or nearby sites. These classes are part of the USU Applied Ornamental Horticulture degree program and can also be used to qualify as a Certified Nursery Professional by the Utah Nursery and Landscape Association.

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Seed germination timing strategies and seedling growth characteristics in wild populations have evolved in response to their life history, ecology, and habitat. In this study, we examined the ecophysiological aspects of seed germination and growth in three Allium species native to the Intermountain West (A. acuminatum, A. brandegei, and A. passeyi). Three populations of each species were studied along an elevation gradient resulting in low, mid, and high elevation sites for each species. We investigated seed dormancy patterns within and among species and their relation to habitat. Seeds collected at the study sites were subjected to cold (3 °C) moist stratification in low light to simulate the natural winter environment under snow. Stratification periods ranged from 0 to 24 weeks. After stratification, seeds were placed in lighted growth chambers at 8 °C to simulate the natural spring environment. Germination was observed for 4 weeks. Germinated seeds were then grown at either 12 °C or 16 °C until leaf senescence. Destructive sampling occurred at 2, 4, and 8 weeks. Bulb mass and water content were also assessed after leaf senescence. In the germination experiment, all species responded favorably to cold moist stratification, suggesting physiological seed dormancy. Germination percentages among species varied greatly with 98% germination in A. acuminatum, but only 33% in A. brandegei. Seedling survival and growth varied among species and in response to growing temperature. Observed patterns in seed germination and growth are typical of survival strategies in other spring ephemerals. Seed dormancy traits and seedling growth characteristics in these species have evolved to allow optimal success for their specific habitat.

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