Flowering will not occur unless induced by temperature and light treatment. If the temperature is held at 50 to 55 degrees F, flowering will occur regardless of day length. But flowering usually is not uniform. Temperatures below 50 degrees F prevent flowering. Nights greater than 12 hours long and temperatures between 59 and 69 degrees also can generate flowers. Twenty-five consecutive long nights is enough for flower initiation. Nights will naturally become greater than 12 hours close to the fall equinox, which is on September 22 this year. A plant receiving natural sunlight but no artificial light during night hours, will have this 25-day requirement met about October 17. Alternatively, plants can be placed in a dark place such as a closet for over 12 hours each day to induce flowering. It takes an additional nine to 10 weeks for flowers to complete development and bloom. Both of these cacti like bright indirect light during the day. Too much sun may cause leaves to turn yellow.
Common household temperatures are fine. Keep soil constantly moist but not waterlogged. These plants seem to flower best if kept a little pot bound. If you need to repot, try waiting until spring. (Ward Upham)