I've had my two M. senilis in this greenhouse for perhaps five years now. They don't seem to mind the frost, and they will receive all the sun we get here in Brum during the winter. Yes, maybe it was not quite cold or sunny enough...
Then again, others grow these with a little bit of heat and still flower them. Their greenhouse might lose the sun altogether from October through the winter, and they still get flowers. I have a red and a white plant on the same top shelf right next to one another. One flowers, the other one doesn't. Compost is the same, they get watered at the same time -- I do wonder what induces flowering in these! Buds do form very early, I can usually see them by December or even earlier.
Nice to know that there are some other early ones to look out for. On my return from work I found this one in flower, with a second plant not far off flowering too: Mammillaria sanchez-mejoradae. No water yet as the nights are still so cold and they are only in a garden frame, but some misting.
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Your seedling is fast getting down to business, Aiko!
