I was just talking to Dear Wife about buying some Baby Bok-Choy that she likes from the store, and then growing the base up to seed. Unfortunately, she does not get that Baby Bok-Choy in our town. She gets it from an Asian Market in St Cloud, MN, which is a 3 hour drive for us. She goes on a shopping trip to St. Cloud with her other local Filipina friends maybe twice a year. So, we might have to wait a while before their next trip.
In the meantime, I have been researching growing greens using the Kratky passive hydroponics system which I think might work for growing greens in the house during our long winters.
I tried growing some Swiss Chard in pots in the house a couple of winters ago. It worked fine for a few months, but then the plants got infested with aphids. Looking back, I am sure that bringing the plants in with their outdoor soil was the problem. But maybe if I can grow things hydroponically, without soil infested with fungus gnat eggs, etc..., I will have more success.

Of course, everything looks easy on YouTube. It sure would be nice to grow fresh greens in the house in the winter months if I can.