Got home today and found a nice surprise. It was pretty warm today and I knew this one was on the verge of needing a drink. The newest mature pseudobulb had previously been really round and smooth, but had a slight taper this afternoon. Then I noticed the 6" spike. Incredible! It wasn't there 60 hours earlier during the last watering.
The plant was given to me last May at the end of blooming, and I was beginning to wonder if it was going to bloom this year.