Dragon fruit flowers (Hylocereus and some Selenicereus species) open at night. You need to be out there with a paintbrush after midnight for best fruit set unless you have a lot of sphinx moths around. Many kinds are self-incompatible. If you have those you need more than one kind flowering at the same time.
They're not good for most gardeners because they get to be very large, heavy, sprawling vines, the size of a small tree. They tolerate essentially no frost. People in southern California and Florida can grow them easily.
They are very easy to grow in a pot, but they get big, fast. The red or yellow lollipop cacti you see sold have a chlorophyll-deficient Gymnocalycium grafted onto a piece of Hylocereus undatus. If the understock sends off a shoot you can let it harden, cut it off and root it.
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