Annual Growth Cycle of <I>Calanthe cardioglossa </I> Schltr.

Abstract

The annual growth cycle of Calanthe cardioglossa Schltr. was studied from the plants grown in the orchid collection plots at the Huai Hong Khrai Royal Development Study Centre, Doi Saket, Chiang Mai. It was found that the plant was of deciduous type and undergone the dormant period throughout the dry season. The growth and development of the plant in a year could be concluded as vegetative phase started in May and ended in January of the consecutive year while reproductive phase started later in September but ended in the same month as that of vegetative phase. Pseudobulb formation occurred in April. The plant entered dormancy in February and resumed the growth in April.