It wouldn't be black locust, there is more to Robinia than the one species.

OK.. who snuck in here.. and changed the name of a geranium ... wow is this one stunning.. mind you... not enough for me to go buy one.. but wow ... lol ken

Thanks! I knew there was a Plant ID forum but could not think of name (I was searching for "ID" and "identification" and couldn't find anything!) The first one looked like ajuga of some kind to me, too, but I didn't want to transplant it somewhere, watering and caring for it, for it turn out to be a weed (not that I've done that before.... okay.... I might have veronica in the mini-green house... or it could be a weed.... Ugh) Thanks again!

I grow Schick hybrids, most are not as tall as that one, and darker green, though the spines and ribs seem the same, and the Schick hybrids do have all of the species in them that is mentioned above, including Rebutia. Well not quiet all of them. And they can be figured out by the flower, if you have the flower chart in color to do so. Keep your labels make duplicate copies of them, and put one in the bottom of the pot. Not all of them look alike, some hardly have any spines, and others have long ones, Bob Schick used to tell them apart by looking at them. Sorry for such a long post, Echinopsis are grown just like any other cactus and need the same care, for flowering give them a low 0-20-10 fertilizer approx. The middle number must be higher, the first number very low. No water in the Winter, they must have the chill and dormant periods to flower. They are extremely hardy, will flower 6 mo. at least of the year from the end of April to the end of Sept. depending on you climate, light where you grow them, feeding. May open 4 nights depending on light. Norma