Abstract
Additional index words. beardtongue, ornamental, Penstemon grandiflorus are ≈2 × 2.5 mm. Seed coat color varies from light to dark brown, 165B to 200C (Royal Horticultural Society, 1982). ‘Prairie Palette’ was grown in bare soil and in a grassy roadside area (Table 1). Of the 672 plants of ‘Prairie Palette’ transplanted to field plots in 1994, 98% of the plants flowered and produced seed in 1995, 92% in 1996, and 9.8% in 1997. Seed was only counted in 1997. Despite being short-lived, self-seeding usually is adequate to sustain the stand. Penstemon grandiflorus plants, including this selection, are susceptible to leaf-spot diseases (Cercospora sp. and Septoria sp.) under conditions of moderate rainfall and/or high humidity. However, this mix was selected for a lower incidence of disease overall. Other pests observed on this species, with only limited injury at North Platte, Nebr., included spider mites (Tetranychus telarius Linne) and stalk borers (Papaipema nebris Guenee). The degree of pest infection varies with year and with location.
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