Cymbidium Kusuda Shining x Douglas Dillon: New pseudobulbs grow, old growths wither

Cymbidium Kusuda Shining x Douglas Dillon

     In early August, I posted about new growths appearing on my cymbidium.  These new pseudobulbs are now 6 inches tall, and growing fast. 

     The cymbidium has 4 "ages" of pseudobulbs currently.  There are the leafless backbulbs, the pseudobulbs that were mature when I purchased the orchid last year, the 2 newly matured growths, and the 2 newest growths from August.  

New cymbidium growth

     While all the newer growths have been adding leaves and getting bigger, the backbulbs have withered into nothing, and the bulbs that were mature last winter have been slowly but continually shedding leaves.  Since the new growths have been vigorous, and the roots seem healthy (if not showing much new growth), I am for now concluding that this must be the normal growth habit for this orchid.