Annnnnnd never mind. Almost immediately after posting, an idea of some different search parameters popped into my head and I found my mystery plant after two links. It turns out to be Hairy Indigo. A non-native plant introduced as a grazing crop from the looks of it.

Mike mangos do very well in containers in the GH. Make sure you get a grafted dwarf variety. They are almost as easy as papayas. Some varieties do better in pots then others. I still think the flavor of container grown fruit up north is inferior to inground and container trees grown trees from down South but it's fun to be able to pick fruit off your own tree. I got rid of most of my fruit trees a while back so that I could devote more GH space to flowering plants. Years ago there were few varieties available in the grocery store and they weren't that ripe or tasty but now I can get a wide variety of ripe mangos at the Asian markets. Have you taken a look at the Tropical Fruit Forum? You can get a lot of good info there.

For Maryland, a professional engineer is not required. My husband did not sit for the exam, but he has been an engineer for 20 years, so he probably has more experience with these types of formulas than most. Having said that, the state provides "guidance" based on best practices, but they don't give a clear example of what might be needed in the calculations for most residential builds. Does that make sense?

This is a known winter tender rose--it sounds like you either need a warmer spot, better winter protection, or another rose. Ideally, you want southern exposure, shielding from wind, and plenty of light--like I have between a wheelchair ramp and a bay window. You could also put tender roses next to a furnace chimney or asphalt driveway. I grow St Patrick near the driveway--it usually doesn't survive winters around here, but I've had it for years.