Abstract
Nine snapdragon cultivars of different response groups were transplanted into a double polyethylene greenhouse to determine the impact of no heat and 25C root-zone heat (RZH) and five night temperatures (NT) (10 to 26C at 4C increments) on plant growth and flower quality. Two weeks after transplanting, stem length was measured biweekly to compare growth rates under the existing conditions. Stems were tagged and the date recorded when the first floret showed color and harvested when the lower third of the florets were at anthesis. Flower quality was evaluated at harvest based upon stem length and fresh weight. Cultivars `Oakland', `Cheyenne', and `Montezuma' were the first to bloom under 26C NT regardless of RZH; whereas, `Potomac Pink' and `Oklahoma' were delayed. Similar trends were observed under each NT with days to anthesis increasing with decreasing NT. Flower quality was improved at the lower night temperatures.
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