I have two Dendrobium anosmum (superbum) which are deciduous. Every year about this time (mid to late October) I begin withholding all water and fertilizer to cause dormancy and leaf shedding. This year I noticed that they are beginning to turn yellow and shed leaves on their own prior to going dry. This made me wonder just what exactly are the triggers? I presumed lack of water corresponding to dry season in SE Asia. Apparently not entirely. It can't be changing day length since they are under CF lights to extend natural day length. They are getting full sun supplemented by CF lights. They are growing indoors and temps have been cooler of late. Maybe temperatures? Any thoughts?
Deciduous orchids, what triggers?
Threaded Mode
