Bok Choy is such a notorious bolter. You have to eat them as soon as ready, or before! I'm thinking of growing some Yu Choy Sum again as the weather gets warmer. At least when they bolt, they're ready to eat.
Also thinking to stick with romaine, since Mom seems to like it and they are slower to bolt than other lettuce. And I'm definitely sowing some more gailan. We are really liking those tender flowering shoots. I've read that you can keep harvesting the side shoots all season, so I want to give that a try.
One of my romaines at the moment is an F1 cross of Red Romaine and Merveille des quatre saisons. Very nice, but it'll be even more fun to pick what is interesting in the F2, so I'll be keeping some going until they produce seeds. Oddly the color is very different under LED compared to the window with fluorescent and natural light. But I guess that is typical of Mde4S anyway - it seems to be a different color in every circumstance.