FLOWERING CONTROL OF COLCHICUM CAPENSE SUBSP. CILIOLATUM

S. Fukai, Y. Monden, T. Narumi, E. Kodaira
Colchicum capense subsp. ciliolatum (Androcymbium ciliolatum) is native to the northern and western capes of South Africa. Several bracts at lower positions on the inflorescence develop well and display an incurved shape with white color producing ornamental value, as evidenced in the English name ‘cup and saucer’. Floral initiation occurs in late August during storage. A series of events in floral organ development was similar to those of tulip. When the corms were planted in October they sprouted immediately and flowered in January to February in a greenhouse without heating. More than 0.5 g corms showed 100% flowering and the number of flowers increased as the corm weight increased. When the corms were grown at constant 15, 20 or 25°C temperatures, flowering was depressed at 25°C. Corms planted in a pot in September were transferred to a growth chamber controlled at 20°C every 15 days from 15 September to 15 December. Longer days to flowering were observed in an earlier start of 20°C conditions. Flowering occurred during the end of December to early January, which indicated no chilling requirement for flowering. To obtain flowering plants in the Christmas season, corms planted in August were transferred to 15 or 20°C growth chambers every 15 days from 15 August to 15 November. Plants transferred to 15°C earlier flowered earlier. The results indicate that high temperatures in summer present an obstacle against forcing culture. Corms stored in 15 to 20°C from early August to the middle of September in the dry condition before planting also produce flowers before the Christmas season.
Fukai, S., Monden, Y., Narumi, T. and Kodaira, E. (2013). FLOWERING CONTROL OF COLCHICUM CAPENSE SUBSP. CILIOLATUM. Acta Hortic. 1002, 131-138
DOI: 10.17660/ActaHortic.2013.1002.15
https://doi.org/10.17660/ActaHortic.2013.1002.15
forcing, pot plant
English

Acta Horticulturae