I find this kind of new-bulb loss is typical of incorrrect temperature to season, either during the growth period or too high a temperature nights, initiating new growth that cannot be supported at that season. D. kingianum requires, not just needs, very low temps during the rest period, around 8°-10° C/45°-50°F. During growth it needs cooler nights, which aids in condensation around the roots. The hybrids are less fussy, but buds are only initiated with cool nights in most crosses.
I suspect your plant(s) was/were not getting enough of a rest under the lights, which tend to be warm. This pushes the plant into growth when it is not yet ready. You didn't mention the kind of lighting, nor the ambient temperatures, therefore I am guessing, but this scenario looks very familiar. I encounter it with many of the newer Formosae hybrids, which are easily confused by high Winter temps. with low humidity (as in a livingroom).
The good new is, you are coming into your Spring and new growths will come. Water and fertilize well, place them outside as soon as the weather allows (if possible). Occaisional drying doesn't seem to cause real damage, but it may slow growth, especially in high Summer, which is at the end of the growth season. My plants will often bloom again in the Summer, if we get strong night temp drops (often in my climate). I can't say this affected the plants long-term, but it is not the natural growth cycle. They still bloom, again, in the late Winter-Spring. Also, when they develope flower buds, do not over-water, rather mist the plants well. Too much water at this time may cause the buds to abort. The plants bloom in the dry season and too much water makes them go into strong growth. This is true of many Dendrobium, especially the species from strong seasonal change.
Hope this helps...
Jamie
Last edited by Regelian; 03-05-2018 at 03:10 AM..
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