Kalanchoe daigremontiana - may I ask about it and other succulents (just behind) being in glass? Are you growing them in it or?

Ditto what rina said :-) And the kalanchoe would prefer 6-8 hours of bright but indirect light.

Do not pull them out to see if they rooted. If you really have to know, just tug cutting gently - just enough to feel if there is any resistance. If yes, that means roots started growing and are anchoring the plant.

If I had some cuttings in water, I would take them out and set them on some paper towels to dry off. They could be gently wiped off too. I would then make sure stems are not too soft or discolored - that is likely sign of rot. If some parts are, they should be cut off or possible mold/rot could spread. After a day or so, I would stick them into mix. I prefer to let them callus first, since 'open wounds' are easy to get infections.

I do not water rootless cuttings for a while, usually when the roots started to grow or some new growth is visible - that usually happens when some roots have grown. Without roots, there is no 'transportation' of water to rest of plant.

I have at least 45-50 pots of cuttings right now (few have more than 1 cutting) and all look like they are rooting. Some I am sure of - they have been potted longer, some I just potted in past few days and it is too early to tell. I do not use any rooting hormones or fungicides; sometimes I dust lightly with cinnamon powder, but only on big cuts. This is how I do it and have to say that vast majority of cuttings root - leaves or stem cuttings. Maybe not 100%, but definitely over 90%.

There are few plants that are more difficult to root, but pretty well all I can see in your photos should.

Cut off the moldy part or spray it with H2O2 3%. I prefer cutting back to very healthy tissue since molds have penetrating root-type structures that go deeper than what we can see on the surface. After the cut, cinnamon . You can put it immediately in your potting media but don't water it for about a week or two to let the cuts heal.

If you've already potted them all up and watered them, you'll need to take them out (even after all that hard work) but if you've not watered yet, leave them there until you see growth. If one shriveled, you can give it one spritz of a spray bottle but that's really it. If you go anymore, you'll probably rot them. This dampening off happens often to me whether I use sterilized media or not.

Kalanchoe are weeds and opportunists. Yours will likely adapt just fine. I have not grown K. daigremontiana but have grown Bryophyllum delagoense, (aka Kalanchoe delagoensis). Mine sits in a SE window for the winter with minimal water. (I do not use supplemental lighting and Michigan winters are not known for an abundance of bright sunny days so I restrict water to prevent growth.) During the summer, it goes outside where it gets full unobstructed sun from 8am to around 2pm. It has never had any issues though if you are in a lower latitude area -- you never mentioned where you live -- your summer sun might be more intense. I have had plantlets fall, land, and grow abundantly in my Sarracenia pots. Sarracenia are bog plants and their media is not only highly water retentive but is kept soaking wet. If daig. is anything like dela. then you just might be able to root it in water and grow it in a very moist soil. :-)

However, by and large, as others have said, water rooting is inadvisable. If the soil is barely damp you may be okay. An occasional sip or spritz of water is really all that is needed until new growth is visible.

Have you kept plants that far away from that window in the past? If it were my window and shelf, I'd love it closer to the glass for more light. My succulents are very light greedy lol.

Those are not flowers, but plantlets. That is how many kalanchoes reproduce - and you don't have to do anything at all, just let them be. They fall off, and will grow wherever they land - just as Paul described above. This is plant that once you get it, you'll have it for ever - most likely. And that is also a reason that in some states it is considered invasive weed. I bought small plant few years ago, and they still pop out in unexpected spots :) Look at how many are in a pot with jade - and I was sure I pulled all of hem out last fall...there are more on other side:

Im not sure if this is the same species but it does propagate the same way. You're looking at what's left after I've tried to kill this plant from my collection at least twice, maybe more.

Now, it's kinda grown on me (pun intended) and I'm thinking maybe I'll keep it around.

If anyone can identify the immature plant, I'd be grateful.

Its mother's "dead body" is still in the pot with it, underneath the canopy.