Washington is all abuzz waiting for the Amorphophallus titanum to bloom. And, when it blooms, it emits a putrid odor. These plants do not have annual blooming cycles. They might bloom every few years or every few decades.
I went to the U.S. Botanic Garden this morning to see this unusual plant, hoping to see the flower and to smell the horrible odor. I saw the plant but it had not yet bloomed, unfortunately. You may watch the progress of this plant at the Garden's website: http://www.usbg.gov/return-titan
Here are my photos of the plant: