Greetings, suckers for succulents! (Sorry, I just had to...
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Back in my college botany class, we had an assignment where we were each given a tiny Kalanchoe plantlet, and whoever had the biggest plant at the end of the semester got a prize. I didn't win, but I treasured my plant and distributed her babies far and wide - one that I gave my grandma in Florida got to be about eight feet tall! The original plant produced thousands, as its common name implies, before she eventually died. I only have half a dozen or so Kalanchoes now, probably grandbabies or great-grandbabies of the class project, because I continually give them away to anyone who wants one. I've moved many times, put my Kalanchoes in all kinds of conditions, and always gotten babies off them, but for some reason now, they're not producing.
The ones I have now have been sharing a pot with a Hoya, but I just transplanted half of them into their own pots, in case it was inhibiting them in some way. They have plenty of root space, get regular water, and are in front of a south-facing window. I'm wondering if I'm babying them too much - the ones that did so well in my office were in Dixie cups and only watered once every few months! But my grandma's giant grew alongside blue-ribbon-winning orchids and was treated like a beloved child, so I don't think torture is necessary.
So, what do you do to make your Kalanchoes pop with plantlets? More water, less water, more light, less light, something to do with nutrients? I can't figure out what I'm doing wrong, because they were so great in so many different conditions before.
I'm not 100% sure, but I'm fairly certain it's Kalanchoe daigremontiana, if that matters. It looks identical to the Google image search results for that name, in any case.