Abstract
Abstract Irrigation interruptions of 0, 2, 4, or 8 weeks were imposed on actively growing ‘Red Lion’ amaryllis (Hippeastrum × hybridum) bulbs to determine the influence of water stress on flowering. Withholding irrigation for 4 or 8 weeks was effective in promoting early flowering of first and second scapes compared to continuously irrigated plants. Irrigation interruptions of 2, 4, or 8 weeks resulted in first scape flowering on all plants by 160, 140, or 60 days, respectively, after resumption of irrigation. Only 83% of continuously irrigated plants flowered within 160 days. Water stress treatments did not influence total number of flowering scapes per plant produced in 160 days nor number of flowers per umbel. Irrigation interruption affected timing of flowering by promoting scape extension and floral development.
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