Abstract
Bulbs of Allium caeruleum were stored at 5°C for 0, 3, 6, 9 or 12 weeks from 20 September, then planted in plastic containers in a greenhouse kept at min. 10°C or 15°C. None of the bulbs flowered when they were chilled for 0 or 3 weeks. The earliest flowering with a good quality flower was obtained when the bulbs were chilled for 9 weeks. High growing temperature (15°C) hastened flowering but decreased flowering percentage and flower quality. The minimal bulb size required for 100% flowering 0.3 g. As the mother bulb weight increased, the number of the daughter bulbs increased and the rate of increased bulb weight decreased.
