I bought it after hearing it was sort of a miniature brug and might work in a hanging basket as a house plant. This thing is huuuuge!
Is it really an Iochroma?

it looks like a brug

SO..just how did you come to believe it might be an iochroma...

Came to believe it to be an Iochroma because that was what the seeds I bid on and won on e-bay were s'posed to be

Those leaves are far too big for Locroma, those are brug leaves.

well...dang...knowing that, they're in way too small of a pot.
Can I let them go dormant?

Iochroma seed are tiny,almost like grains of salt or petunia seed.