Forcing Christmas Cactus Bloom: Dark Period in December

Light/Dark Regimen for Holiday Blooms

Owner asks: 8–11 hours daylight vs. complete darkness day and night—which is correct?

Simple Method: Dark Room/Closet for 2 Weeks Before Christmas

Greg says place in a dark room or closet for a couple of weeks starting now (early December). That's enough to trigger December bloom. Links to Purdue extension FAQ for details.