It is not clear which variety of Cotyledon orbiculata it is derived from, but its cultivar name is 'White Sprite'. It is not a Crassula. :) He may have called it a "Crass" because I said it was some sort of Crassulaceae before you came along and more accurately identified it. Just to clar...

I agree on the Kalanchoe ID. Can you take a picture of the blue plant from the side? It is probably some sort of Crassulaceae. There is no way you can keep them in the same pot. The Portulacaria can become a 8 foot tall bush. My K. mamorata is about 3 feet wide and 3 feet tall, and my Aloe vera is 2...

Even if they don't go in the ground you should translate "vigorous groundcover" as "will take over the pot and smother out everything else". She may be fine with it this year but probably by next year it will need a pot of its own.

They will stay attached as long as you don't look at it funny or speak badly about it! :) It will form a big clump in a relatively short time (a year or two). As long as you don't bump it around too much the heads will stay attached give or take a few. It is only when you try to repot it or otherwis...

Did it look like that when you bought it? I think it is fine as long as that area isn't soft and mushy. Two ideas on what it could be. Maybe a snail chewed on it. Or it looks like that because it originally was part of a big clump that was divided. By that I mean that if a head is smooshed in with a...

Stapeliads are notoriously difficult to ID without flowers. However I'm certain the upright one is a Stapelia, though I couldn't say the species. The hanging one is very likely Orbea variegata.

Three feet? Maybe, but not in your lifetime. One of the bigger species though, and at least two are already a decent size. Don't expect more than another inch or two each year. When they are three feet tall you can stick one on eBay and buy a bigger greenhouse ;) I wonder if the people telling him ...

The Aloe is probably A. marlothii. Xander looks dead to me too, but who knows. The soil they are in is terrible so you should repot them anyway. You'll probably be able to tell if it is alive more easily then.

Do you have a closeup? It looks like some Cholla or maybe a Euphorbia, but hard to be sure with that image. If you have a higher resolution version of it that would help too.

Incidentally, I learned today that an apparent breach has been made in the US nation-wide ban on Lophophora williamsii : "(4) In any prosecution under this section for manufacture, possession or delivery of that plant of the genus Lophophora commonly known as peyote, it is an affirmative defen...

As I said above, I was giving generalities about major groups. Nearly every succulent group has some easy to grow species. So if you'd like to try Stapeliads I'd recommend Orbea variegata. It is the easiest and toughest one, and the flowers are great. They do smell bad, but they aren't obnoxious lik...

Nearly every plant group has some species to avoid, but I think you are asking for major plant groups where enough of the species are finicky that it is easiest to avoid them outright until you get more experience. If so I'd stay away from most Mesembs, including Lithops. Some mesembs are easy, but ...

Probably just sickly. It may come out of it though and eventually look like the others. It is hard to explain, but in general you'll know a true variegate when you see it. In this case if it were variegated I'd expect to see some green, particularly splotchy or a mosaic. This practically looks achlo...

Somebody once asked on the Forum if they could sow seed to get chlorophyll deficient plants to seedling graft. Yes if you are lucky you may get one from a normal sized seed sowing, but it usually requires seed sowing on an industrial scale to find even a couple. For instance Watanabe only got two c...

Both halves look great! Two sprouts isn't unusual at all. If you like two stems keep it that way. If you only want one you can always remove the other. As for the top half, go ahead and plant it. Just don't be too rough with it while potting it up. You want to make sure you don't break the root tips...