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Penstemon seed often shows an inconsistent or a low germination percentage. Although most select cultivars are propagated by cuttings, for export to other countries, seed is preferred. Three experiments were conducted to determine if soaking seed in gibberellic acid (GA3) would increase seed germination of Penstemon digitalis cv. Husker Red. GA3 concentrations used were 0, 10, 50, 100, 200, and 500 mgL -1 (first experiment); 0, 500, 1000, and 1500 mgL -1 (second experiment); and 0, 500, and 1000 mgL -1 (third experiment). The first and second experiments were conducted in a growth chamber, whereas the third experiment was conducted in both a growth chamber and greenhouse withseedseithercoveredornotcoveredbythemix.Inallexperiments,GA3increasedthe percentage and rateof seed germination.The 1000mgL -1 GA3was thebest treatment. In the third experiment, percentage and rate of seed germination were the highest for seeds grown inside of the growth chamber, probably as a result of the consistency of temperatures and darkness. In the greenhouse, the percentage of seeds that germinated and the rate of germination were similar whether or not the seeds were covered with mix and whether they received either the 500 or 1000 mgL -1 GA3 treatment.

Gibberellic Acid Promotes Seed Germination in Penstemon digitalis cv. Husker Red