| The pseudobulbs are little store houses for water and nutrients. When your plant is not at optimum moisture levels it will pull water out of them. I've noted that plants coming out of a greenhouse environment tend to be very plump with no or few wrinkles. Grown in a tripical environment with lots of humidity I would expect the same to happen. If there are any dry periods (in home or in nature) the plant will draw upon its reserves until the conditions allow it to once again begin to save nourishment/plump back up.
So, my guess is that it is a combination of watering frequency AND humdity.
Depending upon your growing environment you may not be able to do much for the humidity - a tray of pebbles underneath will give you approximately and additional 10%. You may need to increase your watering frequency? How often do you water this plant?
Take this for what it's worth - it is just my common sense approach from what I know - you may see from comments to come from other members that my comments are not common nor make much sense?
Enjoy! mike  |