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●ADDITIONAL INDEX WORDS. Bonzi, paclobutrazol, Piccolo, plant growth regulators, Sumagic, Topfl or, uniconazole SUMMARY. Eight experiments were conducted to develop height control protocols for greenhouse-forced hyacinth (Hyacinthus orientalis) bulbs. ‘Pink Pearl’ hyacinth bulbs were treated with fl urprimidol preplant bulb soaks to determine optimal timing of treatment, soak duration, quantity of bulbs that could be treated before the solution lost effi cacy, bulb location of solution uptake, and if higher concentrations of flcan be used to overcome stretch that occurs with extended cold treatment. No difference in height control occurred when bulbs were soaked in flthe day of, 1 day before, or 7 days before potting; therefore, growers can treat bulbs up to 1 week before potting with no difference in height control. All preplant bulb soak durations of 1, 5, 10, 20, or 40 min controlled plant height. Any soak durations ≥1.3 min resulted in similar height control, which would provide growers with a fl exible time frame of 2 to 40 min in which to soak the bulbs. When 1 L of 20 mg·L ‐1 fl urprimidol solution was used repeatedly over 20 batches of fibulbs, solution effi cacy was similar from the fi rst batch to the last batch, indicating the soak solution of flcan be used repeatedly without loss of effi cacy. Soak solution temperature was also tested to determine its effect on fland paclobutrazol uptake. Temperature of the soak solution (8, 16, or 24 °C) had no effect on fland only at a temperature of 8 °C was the effi cacy of paclobutrazol lower. Postharvest heights of ‘Pink Pearl’ hyacinths were similar whether only the top, bottom, or the entire bulb was soaked. Control provided by flpaclobutrazol, or uniconazole preplant bulb soaks varied among the three hyacinth cultivars Delft Blue, Jan Bos, and Pink Pearl, so growers will have to conduct their own trials to determine optimal cultivar response to preplant bulb soaks. Also, ‘Pacino’ sunfl owers (Helianthus annuus) were treated with residual soak solution of fl idol to determine if substrate drenches could be used as a disposal method. Fresh and residual solutions of fl(1.18, 2.37, or 4.73 mg/pot a.i.) applied to ‘Pacino’ sunfl owers were similar in their effi cacy of controlling height, which would enable growers to avoid disposal problems of residual soak solutions.

Hyacinth Height Control Using Preplant Bulb Soaks of Flurprimidol