Something's definitely not right. Here's a picture of your Kalanchoe in the gritty mix performing very well
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along with a couple of other succulents
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I can say that I've never grown a succulent in the gritty mix that didn't absolutely love it.

Let's look at how you made the soil and what you're fertilizing with. What kind of grit did you use - any supplements in it? Any chance the plant might have been damaged by herbicide drift? - it has that 'look'.

I fertilize & water my succulents in the gritty mix the same as I would any other plant - I fertilize over-wintering plants weakly every time I water, which is usually every 3-4 days. In the summer I try to fertilize everything weekly when temperatures allow, but occasionally it might be 2 weeks between. I compensate by using a more concentrated solution in summer.

Al

Those succulents are absolutely beautiful! Thanks for sharing pics.

I used a grit called Gran-I-Grit which I thoroughly washed before hand to avoid tiny residual particles. No supplements.

Definitely no chance of herbicide drift since it's located inside a home which is inside a city.

I have not been fertilizing as often as you describe. So I will try to slowly augment the food I give it to see it that helps.

I was worried it wasn't getting enough sun, but my other succulents seem to be doing fine in the same window.

Thanks for the help!

This one is going to need more light.
Outdoor shade while transitioning, and then into light as strong as that shown in Al's picture.

Josh