cactus flower
Most of the plants I have tried on the south side of the house have not survived. The conditions are harsh. There is only a narrow bed between the brick wall and the concrete driveway and no shade. It's a good place for a cactus though.
This one came with me from Houston, where I had kept it in a pot on a windowsill. For years it had stayed exactly the same size in that pot. It took a year or so for it to take hold here and since then it has grown exponentially. In addition it has started to reward me with these blossoms, each of which lasts only a day.
I never was all that good with houseplants and this may be the only one left of the collection I once had. That makes it the plant that has survived the longest in my care.