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The "dark" period for Christmas / Thanksgiving cacti

I have several Thanksgiving cacti (I'm pretty sure; they're marketed as Christmas cacti, but I think that's wrong).

It's time to start their dark period. The question is, do I water them during that period?

I've read that ANY light during this phase can stop them from blooming, but I haven't quite figured out how to water them in the dark :-O

Ironically, my MIL with a black thumb has a Thanksgiving cactus, and it has blooms all over it!!! No dark phase or anything, it just sits in a South-facing window and she waters it from above whenever she thinks about it! LOL I've followed every dang rule to the letter, and haven't had blooms in years!

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