I have a peruvian apple cactus and a dragon fruit cactus in my yard. I'm not really fond of the apple cactus' blossoms. They are only open for a few hours at night, and then it takes a couple days for them to fall off, and the apple to start growing. They dead blossoms aren't very attractive, so I pick the blooms off before they open.
I've only had the dragon fruit for less than a year, and it hasn't flowered yet. I'm not sure how long it takes, but it has been growing fast. It's a bit of a challenge to keep all its limbs supported.


