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!

There was no distribution map for Georgia, but judging by Tennessee I'd say it might be out of its optimal range. Here is a link that might be useful: USDA TN County Distribution A. syriaca

The leafy one looks like a Senecio. If it has a yello daisy like flower, it is. The spikes one is a Deuterochonia, previously called Abrometiella. Mir is Avery spikey bromeliad, and grows like a succulent rather than like the soft leaved bromeliads.

"If it isn't noxious I might put it in a better location." It has the potential to be a problem in your area if you let the seeds ripen. Here's a page from BONAP that shows location of noncultivated clematis presence in the US, so you can scroll down to find maps of where C. terniflora is found to have escaped into the wild (as yours probably did since you have 3 and it's nonnative.) Blue are states where it has been found feral, and turquoise shows the actual counties where it has been found as an escapee.