Abstract
Successive batches of pot chrysanthemums, cv. Bright Golden Anne, were grown in glasshouses in each of three winters. Five unrooted cuttings were stuck in one litre ‘half pots, given two weeks of long days using night-break lighting, and then transferred to short days for the remainder of the production period. Samples of pots were given supplementary lighting from high pressure sodium lamps at 17.2 W m-2 PAR for 11 h day-1 for the first two weeks of short days. The daily solar radiation integral was measured with a Kipp solarimeter throughout the production period of each of the crops. Solar radiation or supplementary light did not affect the variability in height of the five plants in a pot. The solar radiation integral during the long-day period was only weakly correlated with the number of days to flowering, and was not correlated with the number of flowers showing colour per pot, or with the variability of flowering of the five plants in a pot. There were strong correlations between the mean daily so...
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