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Spigelia marilandica (India pink, pinkroot), a herbaceous perennial native to the United States, is underused in the nursery trade, in part because it is difficult to propagate. We found from the first of two studies conducted during winter 2007 that stem-tip cuttings collected from greenhouse-grown stock plants submersed in 3000 or 6000 ppm (mg·liter−1) potassium salt of indole-3-butyric acid (IBA) for one minute had greater percentage rooting (average 76.6) than cuttings not treated with IBA (46.9). Bottom heat [average 27.2C (81F)] compared to no bottom heat [23C (73F)] increased rooting percentage from 48 to 85%. The second winter 2007 study determined that rooting percentage according to method of application of 3000 ppm IBA was in the order: solution dip (60.1) > powder dip (49.8) ≥ solution submersion (46.6) ≥ control (42.7). During summer 2009, bottom heat and the same methods of application of 3000 ppm IBA described above were applied to terminal (stem tip) or subterminal cuttings collec...

Effect of IBA Treatments, Bottom Heat, Stock Plant Location, and Cutting Type on the Rooting of Spigelia marilandica Cuttings