We've been experiencing record heat and heat indexes: yesterday topped out at 98 degrees with a heat index of 120. It has been tough on most people and things - except this: a cactus given to me a few years ago by one of my bosses.
It came from Arizona with just a small amount of sand attached to it. I merely put it in a pot that would protect my hands from the sharp thistles and put it in one of the window sills at work. I typically watered it twice a year. Really. About 6 weeks ago, I moved it to a sunnier window and on Monday I noticed what looked to me like flower buds. I checked on it this morning and was thrilled to see it in bloom. It must love it in the sun!!