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Lomatium species are important botanical components in the rangelands of the Intermountain West. Relatively little is known about the cultural practices necessary to produce Lomatium seed for use in rangeland restoration activities. The seed yield response to four biweekly irrigations applying either 0, 1, or 2 inches of water (total of 0, 4, or 8 inches/season) was evaluated for four Lomatium species over multiple years starting in 2007. Over seven seed production seasons, Lomatium dissectum (fernleaf biscuitroot) seed yield was maximized by 5-6 inches of water applied per season in cooler, wetter years and by 8 inches of water applied per season in warmer, drier years. Over nine seed production seasons, L. grayi (Gray’s biscuitroot) seed yield was maximized by 0-5 inches of water applied per season in cooler, wetter years and by 5-8 inches of water applied per season in warmer, drier years. Over nine seed production seasons, L. triternatum (nineleaf biscuitroot) seed yield was maximized by 4-8 inches of water applied per season in cooler, wetter years and by 8 inches of water applied per season in warmer, drier years. Over four seed production seasons, L. nudicaule (barestem biscuitroot) seed yield did not respond to irrigation. In two seed production seasons, seed yield of L. suksdorfii (Suksdorf’s desertparsley) responded to irrigation in one year.

Irrigation Requirements for Seed Production of Five Lomatium Species in a Semiarid Environment