This seems to spread from one leaf to another. It started on my Datura and and is now on my pepper plants too. Is there an insect causing this or something else. I don't see anything.

How big is it? How hot? What kind of light is it getting? Intermediate light ABOVE Phal light is the min. The more light the better. Medusae prefer to be mounted on tree fern or on wood/spag. Heck I'd throw some spag in a tree fern pot. Roots need to almost dry out before watering again but never let the roots completely dry. my guess- your mix is too dry and you have some dead roots. Probably needs more light. Like I said before, Medusae is tricky. Mike

Endless summer hydrangeas are macrophyllas. IOW those who usually bloom on old wood. They, however, are mutants who bloom not only on old wood, but new wood. They became popular for folks not only to extend the bloom time, but the zones in which a macrophylla could be grown and reliably bloom. If your's isn't blooming yet, it is probably because you pruned off the old wood it would be blooming from. Another reason for low bloom response is the buds set on the old wood were frozen out in a hard winter. So, if you had severe weather last winter, they may not have bloomed on the old wood anyway. We wait until spring to prune our Endless summer and any other macrophylla to see how much old wood survived. On our standard bushes, we don't expect bloom. On the Endless Summer we expect some bloom when the new wood is mature enough. You should be getting some bloom later on your new wood.

@cari, yes, I will work on acclimating it so it doesn't get shocked. I use pebbles on top of most of my other plants and will do that here too. @rina, I don't know a ton about growing succulents and was trying to err on the side of not being too wet. (Most of my other plants are ferns that I water with mindless abandon and they couldn't be happier. I know succulents need to be treated differently.) I read that succulents absorb water through moisture in the air around their roots, which is why it was important to have coarse soil. Is that incorrect? Mostly I didn't think about it being difficult to rewet until Cari asked, and apparently I was somewhat overconcerned about accidentally drowning the plants. I plugged up the drainage hole last night and have it a long, slow watering to completely soak the soil, and then opened the hole again. Should the echeveria completely dry out until the soil is bone dry before I water again (provided it doesn't croak) or can it be watered when it's just a bit damp still? I was thinking of seeing how the plant does with more water before trying to repot. What are your thoughts? Here's a picture of the soil mix I used. The white bits are pumice. I'd say that picture makes it look like there's more pumice in the mix than there is (meaning more has settled toward the top), but there's definitely a lot more in this than there is vermiculite (I think) in "normal" potting soils. Also this is a pretty small bag, maybe a total of two gallons, just to give some scale to the size of the pieces. Thanks!!