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This study aimed to assess the effects of plant growth regulators (PGRs) on stock plant production of mojave sage ( Salvia pachyphylla ) and ‘Avalanche’ cape daisy ( Osteospermum  hybrid) that received foliar sprays of the following three PGRs: 200 and 400 ppm ethephon; 250 and 500 ppm benzyladenine; and 50 and 100 ppm gibberellic acid 4 and 7 (GA 4+7 ) plus benzyladenine. Vegetative growth [height and width growth index (GI)], the number of vegetative cuttings, and fresh weight (FW) and dry weight (DW) of the harvested vegetative cuttings data were collected. A propagation study was conducted concurrently to determine the effects of the PGR treatments on rooting vegetative cuttings. GA 4+7  plus benzyladenine (50 and 100 ppm) increased the production of both mojave sage and ‘Avalanche’ cape daisy cuttings by ≥18% more than the other treatments. The GI, FW, and DW results showed similar trends across experiments 1 and 2 for each perennial. In the propagation study, the rooting percentage did not differ after 4 weeks, indicating that the use of GA 4+7  plus benzyladenine in production protocols could benefit producers of both perennials.

Influencing Stock Production of Mojave Sage and Cape Daisy with the Application of Plant Growth Regulators