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In Northern Italy, two trials have been performed on  Lilium  and poinsettia cultivars to control plant height by day–night temperature regimes. Two identical glasshouse compartments have been used for the experiments: one maintained at standard conditions (the same minimum and ventilation temperatures during day and night), the other with minimum day temperature lower than night. Cultivations of lilies and poinsettias started in Winter and Summer 1993, respectively, with different climate conditions (cold in winter and hot in summer). Results on  Lilium  indicated that a good control of greenhouse temperature can be achieved in Italy's winter climate, even on sunny days; the best height reduction (30%) was obtained on  Lilium longiflorum  cv. `White American', compared to other  Lilium  species. Test on poinsettia have been based mainly on controlling ventilation of the glasshouse to raise temperature in the first part of the night and to lower it during the first daytime hours.

Is the DIF Technique Suitable for the Italian Climate