ABSTRACT
<italics>Euphorbia fulgens</italics> is a native of Mexico and a member of the family Euphorbiaceae; it is readily propagated by means of stem cuttings and is grown in glasshouses either as a specimen flowering plant or for cut-flower production, when the whole flowering shoot is marketed. Temperature, daylength, and light intensity interact in influencing flowering, for the critical daylength becomes shorter at higher temperatures. Flower initiation occurs earlier at high light intensities, after the formation of fewer nodes by the growing point of the main shoot, and the first flowering side shoot is found lower down the main stem. Soil moisture had very little effect on the time of initiation of flowers by the side shoots at any temperature, though fewer nodes were formed in the “dry” treatments, and the first node with flowers was usually found lower on the plant.
