FYI Bok-Choy is in the mustard family. They bolt - go to seed from a spring planting for me. Triggered by days getting longer. If planted when days are getting shorter they do not bolt. In the south I think they are grown in late winter I think. Here they will go to seed in late May
I am looking forward to having a few of my Bok-Choy plants bolting so I can save the seeds. I just started saving bean seeds a few years ago and that has been successful for me. So, now I want to try other plants as well.