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 Queen of the Night, Selenicereus grandiflorus

Q: What can you tell me about night blooming cactus?

A:  I can tell you this name is applied to several cacti so it is difficult to determine on exactly which one you need additional information.   Queen of the Night, Selenicereus grandiflorus, grows best in cold hardiness zones 10-11 which means only in certain parts of south Florida.  We are in cold hardiness zones 8b-9a.  If you are interested in this plant you might consider putting it in a container so you can move it inside when temperatures drop during the winter months.  It produces very fragrant, white to cream colored flowers which open during the evening hours.  It can potentially reach 30-40 feet in height.  Or you might mean Hylocereus undatus, which also grows only in zones 10-11.  This plant also can reach heights of 30 feet.  The flowers are huge, some measuring 14 inches long by 12 inches wide.