My impression is that the flowering of mammillaria senilis strongly depends on the sun exposure during the winter and on the temperature range.
I enclose this year's graph of greenhouse temperatures (measurements every 30 minutes).
Ruggero

In early spring, even if the night is cold, it doesn't take long to bloom on sunny days. It is such a particular shape and such an intense color that it immediately draws the eye upon entering the greenhouse...

they are beautiful plants! Thanks for sharing. Ruggero

It is not easy to be able to designate this month's favorite due to the beauty of the images that have been posted and which impressed me very much. In particular I was attracted by the post of Aeonium 2003 for the spectacularity of the bud but the gathering of thorns of Christian's Maihueniopsis da...

Thank You, Ruggero

Which Echinofossulocactus (Stenocactus) will it be? Could I have your help? Ruggero

it seemed necessary not to leave the ending in suspense ... Ruggero

What an amazing spectacle of shapes and colors! The end of winter often revolutionizes how much we are used to sharing in the rest of the year.
Ruggero

I fear that I have not correctly expressed in my words how magical this seasonal transition period can be. So I take the liberty of posting images that explain my February sharing proposal with the hope that you can participate with a palette of shades of colors. The colors and shapes of late winter...

February is the month that prepares for the arrival of spring: the plants are often tested by the cold and the absence of water for long months. What are the colors they have taken on? How much have they changed in their appearance? I am excited because I imagine the extraordinary specimens that are...