Though the cereus is sometimes ever blooming, mine blooms in autumn. The blossoms, that mimic the lotus, last only 12 hours over night, and I was lucky to get these photos.
When frost comes, it comes inside to sulk until spring. I bought mine from Logee's Greenhouses.
It is a big plant, and can throw out 6 foot canes, though it can be tamed with shears. I have seen pictures of it used in bedding schemes, but of course that was in the tropics.
It is very fragrant!