Yes, Chijimisai is wonderful, we like the milder brassicas and this is a good one. Lovely photos, Elaine. Mine is also bolting now and I'll save seed, also have some seedlings coming up for spring. I also grow Fun Jen (think it's a Chinese cabbage) and it is very prolific in winter and spring. Another bok choy that has done well over the winter is Lady Murasaki, pretty purple leaves.
I forgot to add arugula to my previous list of things--I guess because we eat it so often! When the lettuce isn't coming in we eat it on sandwiches instead. We like it even when it gets a little strong and the flowers are yummy too.
