There is no wrong way, they are always edible, just depends on how big you want them and how much you plan to use.

You could do one large single plant in the 3 gallon, or a trio of three plants in 7 or 10 gallon. I would plant a bunch of seeds in the larger bags then thin out and eat the small plants whenever you want while letting 3 core plants to grow large to cut.

I've tried the Beni Houshi mizuna from Baker Creek, and it was very slow to bolt for a mustard. Mizunas I've bought from nurseries always bolted quickly in May. Chijimisai is said to be very slow to bolt.

Thank you Robert! I was coming to that conclusion..I could always remove and eat some if I had planted too many. I am looking forward to tasting these greens!

I grow early and summer mizuna. About 6 can go into a 18 gallon tote. They have fairly shallow root systems, so the depth isn't absolutely necessary. But 6 of them can fill up the elbow room of the tote pretty well, those are around 24x18 rectangle of surface space. A 16" 10 gallon pot has about half the surface space, so maybe 3 per 10 gallon pot. Or do one each in the 3 gallon pots. You will have to watch the watering more with those. Greens like their water.

I haven't grown chjimisai. I have a smaller tatsoi in the garden, can't remember the variety. But looking at Baker Creek it looks like they might be similar to size like mizuna.

I tend to remove back the biggest/oldest leaves most of the time, and let the younger greens grow out more.

Awesome, Thank you Bee! This is going to be fun :)