Thanks, Michael! I've had three tips do this all of a sudden this year and couldn't figure it out. I thought maybe it was a water issue because it happened with the three new roses in the three new pots I bought this year. I thought maybe the drainage holes were to small and water was collecting in the bottoms so I reamed bigger ones. But there was no other signs on the rest of the bushes, like yellowing leaves, so I wasn't too sure. Now I'm thinking this critter was the answer. Thankfully I did snip the wilted tips off right away and disposed of them. I'll keep an eye out for any further incidents and check for the larva.

Thanks for your help...I had no idea whatsoever. I've never seen one before, and certainly never seen a male or anything else like it. But I just looked it up and it's not a nice bird to have around. I think it went away and I sure hope it doesn't come back. Here is a link that might be useful: Cowbird eggs in nestboxes -- Sialis.org

Just to clarify, I only placed them in my larger outdoor pots while I was outside. Somehow, they found their own way into my smaller- & medium-sized pots all on their own. Which happened while my plants were outdoors. I didn't even know that they were there until I went to soak my pots. And even then, there were only a few of them. All of which were a fraction of the size of the outdoor earthworms. No bigger than the ones in iamhopscotch's photos. They have been there for at least two years now and not once have they ever negatively affected the health of any of my plants. So I pretty much leave them alone. I don't use them to aerate my already fast-draining soil. And even if they "break down" the soil, "Earthworms leave behind excrement or castings containing from 5 to 11 times the amount of nitrogen, phosphorus, and potassium they have ingested." All of which the plants can use.I repot my plants long before the soil gets depleted, and the old soil gets tossed out into the remote corners of my yard, along which whatever's inhabiting it. Even if my new, fresh potting soil were to somehow gain newer earthworms, I wouldn't go out of my way to try and rid them from my pots. People want to try and grow their plants in sterile environments, dousing their plants with fungicides and insecticides, and nature doesn't work like that. I'm not advocating putting earthworms in your indoor pots. I was simply stating that I found them in my indoor plants and never once have I encountered any problems from them being there. Sure, I placed them in my large, outdoor pots. But that was because those pots stay outdoors year-round. The smaller earthworms found their own way into my smaller pots, while those pots were outdoors. People claim that they can't survive living in containers, but the small ones in mine seem to do just fine. Even if they were to die, their remains end up breaking down into enriched nutrients that the plants can use.

Echeveria, unsure of cultivar though. Maybe someone with a better eye will pop along to offer additional help. I think the flowers are used to identify, if I remember correctly, so you're in luck!!!