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Increasing fertilizer levels may reduce production time but can lead to excessive growth of herbaceous perennials, requiring the application of plant growth regulators (PGRs). This study investigated the effects of ascending fertilizer rates in conjunction with two rates of uniconazole and a control. Rooted liners of  Artemisia arborescens  L. `Powis Castle',  Artemisia vulgaris  L. `Oriental Limelight,  Astilbe chinensis  (Maxim.) Franch. `Pumila',  Filipendula rubra  (Hill) Robinson `Venusta' and  Perovskia atriplicifolia  Benth. were potted with controlled-release fertilizer (15N-3.9P-10K) incorporated at 2.4, 4.72, and 7.11 kg·m -3 . A single foliar spray application of uniconazole was applied two weeks after transplanting at a volume of 210 mL·m -3  and two rates from 15 to 60 mg·L -1  plus a control (species-dependent). Plant height and width were measured at 2,4,6, and 8 weeks after treatment (WAT). No interactions between fertilizer rate and uniconazole were observed. Main effects varied by species. The application of uniconazole controlled height and width of  Artemisia  `Oriental Limelight' and  Astilbe  for the duration of the experiment. Height, width, and dry weight of  Artemisia  `Oriental Limelight' increased with ascending fertilizer rates while  Astilbe  was not affected. Growth of  Filipendula  and  Artemisia  `Powis Castle' was unresponsive to uniconazole, though dry weight was reduced for both at the lowest fertilizer rate. Uniconazole provided height control of  Perovskia , but the effect did not persist beyond 6 WAT. Ascending fertilizer rates increased  Perovskia  dry weight but not height.

Balancing Act: Effects of Fertilizer and Uniconazole on Growth of Herbaceous Perennials