Abstract
Abstract Carnations (Dianthus caryophyllus cv. White Sim) planted August, 1970 were grown under long (LD) or normal (ND) daylengths and 4 continuous soil heating treatments, (none, 18°, 21°, 32°C). The rate of leaf unfolding and flower development was nearly equal for all treatments, although flowers appeared to initiate 3 weeks earlier under LD. Peaks of cut flower production were 1 month earlier and of greater magnitude under LD than ND. High soil temp (21°, 32°) under ND (winter daylengths) delayed peak flower production by another month. Total flower production was significantly greater with the plants grown under LD. Flowers from plants with high soil temp (21°, 32°), particularly those under LD, were of significantly better quality than those at 18° or without supplemental soil heat.
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