Yesterday morning my mom said she would send me some pictures of an orchid that had started blooming in my room at the house in Michigan. I was expecting it to be some kind of Phalaenopsis or allied hybrid, of which there have always been a few somewhere in my collection of houseplants. I was surprised, then, when the pictures came and the blooming orchid was in fact a Dendrobium hybrid which I had bought at Trader Joe's when I was still in high school and which had not flowered in many years.
The Dendrobium in question, against the background of my parents' Mid-Century Modern sitting room
This makes me wonder what triggered it to bloom after all these years. For the one other Dendrobium that I had owned before this back in Germany, the trick appeared to be a noticeable difference between night and day temperatures during the summer, best achieved by putting the plant in a sheltered place outdoors. I wonder if a change in temperatures was involved here as well.