It is a reed stem epidendrum and it will take temperatures down to freezing. A garden plant that needs almost full sun. Just tidy it up by cutting off dead bits and seed pods, pot it or place it in a rockery. My (garden plant) ones are growing against a western fence so they get shelter from the afternoon sun on extremely hot days (over 100F) Too much shade will encourage lanky growth and fewer flowers. Better quality ones are in a shadehouse.

The floors were covered over from the weeds so I'm not sure what's there. The people who used to live there used the greenhouses to start tobacco seedlings at one point. It's either gravel or dirt. Is one better than the other? The frames are in pretty good shape, but do have some rust spots so it looks like I need to get those smoothed out. Thanks for that heads up! The thought of being a market grower hasn't even crossed my mind. We have little gardening space at our current property, so I was just happy to have the space and facility to start seeds and have a warm place for tropicals that we've wanted for a while. The idea isn't out of the question, but probably a year or two more out. I am overseeing two community gardens this coming year, so I had considered starting seedlings to sell to members out of the greenhouse. I just want to make sure I take the time and make the right choices now to grow into the space as the years go by.

I think the problem, apart from being indoors, may be too much TLC ;-) Firstly, it seems you have massively overwatered. Secondly, to remove aphids just sloosh the foliage under the tap while carefully holding the pot sideways. Forget the spraying and dish soap.Thirdly, when transplanting your next effort make sure you have a well draining gritty mix. Fourthly, although this is a Mediterranean plant I would keep it as cool as possible in a house and in the brightest spot you can find after a period of acclimatization. Fifthly, don't remove any leaves unless they are definitely totally dead, in which case they should drop by themselves. Sixthly, you say you have propped it up on other plants. I would get it away from other plants. It needs air around it. Most herbs sold in supermarkets have been forced to grow fast and lush for sale to use in cooking, not as long term plants for growing on, so you need to get them toughened up before they will thrive. In sage and many other shrubby herbs lush is not necessarily tasty. The essential oils develop best in more robust leaves which have had to work for their living. They evolved, after all, as defence against adversity.

Cactus flowers... possibly dragon fruit.