Postharvest height suppression of potted tulips with paclobutrazol.

(...) Paclobutrazol pre-plant bulb soaks at 2.5 or 5.0 mg . liter -1 prevented excessive scape elongation during low light exposure, whereas ancymidol bulb soaks were ineffective. Neither plant growth regulator reduced flower size or affected petal color. Paclobutrazol applied as a soil drench or as a bulb soak increased days required up colored bud stage up to 4 days, whereas neither chemical affected post-greenhouse life of tulips