I have some Argentine Giant Cereus Cactus’ (Echinopsis Candicans, I think) that blooms in the spring, and only blooms overnight. I set up my Nikon D300 to film time laps shots of the cactus as it blooms, using the cameras’ intervelometer setting. I got some great results in mid May. This cactus, also sometimes called a “Torch Cactus”, has a breathtaking flower. I put together a short movie/video of the bloom in action.