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For success in planting bitterbrush, the soil at planting depth must remain moist during germination and emergence. Fall-planted seed is in the ground ready to germinate as soon as the soil warms up. Emergence is usually 3 to 4 weeks later from spring planting. In tests in northeastern California spring plantings proved best where either or both of two conditions were met: precipitation was adequate and well distributed during the critical period and the soil retained moisture well. On drier sites or in very dry years on sites normally adapted to spring planting, fall planting was usually superior.
Bitterbrush [Purshia tridentata (Pursh) DC] plants were burned or clipped, fall and spring, under different soil moisture conditions on two sites in east-central Oregon. Treatments, on plants of an erect growth form on the Juniperus/Artemisia-Purshia site resulted in 38% of the fall-clipped and 40% of the spring-clipped plants sprouting. None of the unwatered fall-burned plants sprouted, nor did any of the fall- burned plants that were watered 24 hours prior to burning. Ten percent of the plants that were watered after fall-burning and 30% of the spring-burned plants sprouted. On the Pinus/Purshia site treatments on plants of a lower-growing, decumbent form of bitterbrush resulted in 69% of the fall-clipped and 90% of the spring-clipped plants sprouting. None of the unwatered, fall-burned plants sprouted although 20% of the plants watered prior to fall-burning and 10% of the plants watered after fall- burning sprouted. Fifty percent of the spring-burned plants sprouted. Within sites, sprouting of clipped plants on either site did not appear to be related to plant size, age, or soil moisture. Burning was more damaging on both sites than clipping and fall-burning more damaging than spring-burning.
A useful and complete summary of all the scientific information available on one of the most significant plant species in the western and intermountain regions. Among the plant species of the great Basin rangeland, the Purshia—ancient members of the rose family evolved to survive the aridity and temperature extremes of this harsh region—are one of the most important. This book-length study of this key plant species provides a comprehensive examination of the biology and ecology of the species and region.