The best replacement for bok choy is napa cabbage.

The best alternatives to bok choy are rated as following:
★★★★★  napa cabbage
★★★★  baby bok choy
★★★  pak choi
★★  chinese cabbage
★★  cabbage
★★  swiss chard
★  fennel
★  bok choy
★  pak choy
  leek
  broccoli
  leeks
  pok choy

Your alternative for bok choy is not listed? Suggest!
Speaking about bok choy, one probably shouldn't forget about oyster sauce.

Other search terms related to bok choy and their ratings are:
★★★★★ oyster sauce
★ rice noodles
★ black mushrooms
shiitake mushrooms
You have in mind a companion for bok choy and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bok choy in all years. Click on graph for more.
bok choy
napa cabbage
baby bok choy